diff --git a/LabWise.xcodeproj/project.pbxproj b/LabWise.xcodeproj/project.pbxproj
index d3fedca..6ee0adf 100644
--- a/LabWise.xcodeproj/project.pbxproj
+++ b/LabWise.xcodeproj/project.pbxproj
@@ -431,7 +431,7 @@
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CODE_SIGN_ENTITLEMENTS = LabWise/LabWise.entitlements;
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 1;
+				CURRENT_PROJECT_VERSION = 2;
 				DEVELOPMENT_TEAM = YK2DB9NT3S;
 				ENABLE_PREVIEWS = YES;
 				GENERATE_INFOPLIST_FILE = YES;
@@ -469,7 +469,7 @@
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CODE_SIGN_ENTITLEMENTS = LabWise/LabWise.entitlements;
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 1;
+				CURRENT_PROJECT_VERSION = 2;
 				DEVELOPMENT_TEAM = YK2DB9NT3S;
 				ENABLE_PREVIEWS = YES;
 				GENERATE_INFOPLIST_FILE = YES;
diff --git a/LabWise.xcodeproj/xcuserdata/adipu.xcuserdatad/xcschemes/xcschememanagement.plist b/LabWise.xcodeproj/xcuserdata/adipu.xcuserdatad/xcschemes/xcschememanagement.plist
index a9c03c8..54c14a0 100644
--- a/LabWise.xcodeproj/xcuserdata/adipu.xcuserdatad/xcschemes/xcschememanagement.plist
+++ b/LabWise.xcodeproj/xcuserdata/adipu.xcuserdatad/xcschemes/xcschememanagement.plist
@@ -7,7 +7,7 @@
 		<key>LabWise.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>1</integer>
+			<integer>0</integer>
 		</dict>
 	</dict>
 </dict>
diff --git a/LabWise/AddChemicalView.swift b/LabWise/AddChemicalView.swift
index ef54e89..dd5e59b 100644
--- a/LabWise/AddChemicalView.swift
+++ b/LabWise/AddChemicalView.swift
@@ -66,19 +66,21 @@ final class AddChemicalViewModel {
     }
 
     /// Edit mode — all fields pre-populated from the existing chemical.
+    /// Required fields may be nil on rows that were imported with missing data;
+    /// the form will show them blank and require the user to fill them in to save.
     init(editing chemical: Chemical) {
         self.editingID = chemical.id
-        chemicalName = chemical.chemicalName
-        casNumber = chemical.casNumber
-        physicalState = chemical.physicalState
-        storageDevice = chemical.storageDevice
-        piFirstName = chemical.piFirstName
-        bldgCode = chemical.bldgCode
-        lab = chemical.lab
-        storageLocation = chemical.storageLocation
-        numberOfContainers = chemical.numberOfContainers
-        amountPerContainer = chemical.amountPerContainer
-        unitOfMeasure = chemical.unitOfMeasure
+        chemicalName = chemical.chemicalName ?? ""
+        casNumber = chemical.casNumber ?? ""
+        physicalState = chemical.physicalState ?? ""
+        storageDevice = chemical.storageDevice ?? "Glass Bottle"
+        piFirstName = chemical.piFirstName ?? ""
+        bldgCode = chemical.bldgCode ?? ""
+        lab = chemical.lab ?? ""
+        storageLocation = chemical.storageLocation ?? ""
+        numberOfContainers = chemical.numberOfContainers ?? ""
+        amountPerContainer = chemical.amountPerContainer ?? ""
+        unitOfMeasure = chemical.unitOfMeasure ?? ""
         chemicalFormula = chemical.chemicalFormula ?? ""
         molecularWeight = chemical.molecularWeight ?? ""
         concentration = chemical.concentration ?? ""
diff --git a/LabWise/ChemicalDetailView.swift b/LabWise/ChemicalDetailView.swift
index 05c6142..e963cf0 100644
--- a/LabWise/ChemicalDetailView.swift
+++ b/LabWise/ChemicalDetailView.swift
@@ -57,28 +57,44 @@ struct ChemicalDetailView: View {
 
     var body: some View {
         Form {
-            Section("Identity") {
-                LabeledContent("Name", value: chemical.chemicalName)
-                LabeledContent("CAS Number", value: chemical.casNumber)
-                if let formula = chemical.chemicalFormula {
-                    LabeledContent("Formula", value: formula)
-                }
-                if let mw = chemical.molecularWeight {
-                    LabeledContent("Molecular Weight", value: mw)
-                }
-                LabeledContent("Physical State", value: chemical.physicalState.capitalized)
-                if let conc = chemical.concentration {
-                    LabeledContent("Concentration", value: conc)
+            let missing = chemical.missingFields
+            if !missing.isEmpty {
+                Section {
+                    VStack(alignment: .leading, spacing: 6) {
+                        HStack(alignment: .top, spacing: 10) {
+                            Image(systemName: "exclamationmark.triangle.fill")
+                                .foregroundStyle(.orange)
+                            VStack(alignment: .leading, spacing: 2) {
+                                Text("Missing \(missing.count) required \(missing.count == 1 ? "field" : "fields")")
+                                    .font(.subheadline.weight(.semibold))
+                                Text(missing.joined(separator: ", "))
+                                    .font(.caption)
+                                    .foregroundStyle(.secondary)
+                            }
+                        }
+                        Text("Tap Edit to fill them in.")
+                            .font(.caption2)
+                            .foregroundStyle(.secondary)
+                    }
                 }
             }
 
+            Section("Identity") {
+                row("Chemical Name", chemical.chemicalName, required: true)
+                row("CAS #", chemical.casNumber, required: true)
+                row("Formula", chemical.chemicalFormula)
+                row("Molecular Weight", chemical.molecularWeight)
+                row("Physical State", chemical.physicalState?.capitalized, required: true)
+                row("Concentration", chemical.concentration)
+            }
+
             Section("Storage") {
-                LabeledContent("Location", value: chemical.storageLocation)
-                LabeledContent("Device", value: chemical.storageDevice)
-                LabeledContent("Building", value: chemical.bldgCode)
-                LabeledContent("Lab", value: chemical.lab)
-                LabeledContent("Containers", value: chemical.numberOfContainers)
-                LabeledContent("Amount / Container", value: "\(chemical.amountPerContainer) \(chemical.unitOfMeasure)")
+                row("Storage Location", chemical.storageLocation, required: true)
+                row("Storage Device", chemical.storageDevice, required: true)
+                row("Building Code", chemical.bldgCode, required: true)
+                row("Lab", chemical.lab, required: true)
+                row("# of Containers", chemical.numberOfContainers, required: true)
+                amountRow
                 if let pct = chemical.percentageFull {
                     LabeledContent("% Full") {
                         HStack(spacing: 8) {
@@ -92,25 +108,15 @@ struct ChemicalDetailView: View {
             }
 
             Section("Vendor") {
-                LabeledContent("PI", value: chemical.piFirstName)
-                if let vendor = chemical.vendor {
-                    LabeledContent("Vendor", value: vendor)
-                }
-                if let catalog = chemical.catalogNumber {
-                    LabeledContent("Catalog #", value: catalog)
-                }
-                if let lot = chemical.lotNumber {
-                    LabeledContent("Lot #", value: lot)
-                }
+                row("PI First Name", chemical.piFirstName, required: true)
+                row("Vendor", chemical.vendor)
+                row("Catalog #", chemical.catalogNumber)
+                row("Lot #", chemical.lotNumber)
                 if let exp = chemical.expirationDate, !exp.isEmpty {
                     LabeledContent("Expiration", value: formatDate(exp))
                 }
-                if let barcode = chemical.barcode {
-                    LabeledContent("Barcode", value: barcode)
-                }
-                if let contact = chemical.contact {
-                    LabeledContent("Contact", value: contact)
-                }
+                row("Barcode", chemical.barcode)
+                row("Contact", chemical.contact)
             }
 
             if let comments = chemical.comments, !comments.isEmpty {
@@ -129,7 +135,7 @@ struct ChemicalDetailView: View {
                 }
             }
         }
-        .navigationTitle(chemical.chemicalName)
+        .navigationTitle(chemical.displayName)
         .navigationBarTitleDisplayMode(.inline)
         .toolbar {
             ToolbarItem(placement: .topBarTrailing) {
@@ -157,4 +163,46 @@ struct ChemicalDetailView: View {
             chemical = match
         }
     }
+
+    /// Combines "<amount> <unit>" — both required, so we show a Missing
+    /// placeholder if either side is empty. Yellow-tinted when incomplete.
+    @ViewBuilder
+    private var amountRow: some View {
+        let amt = (chemical.amountPerContainer ?? "").trimmingCharacters(in: .whitespaces)
+        let unit = (chemical.unitOfMeasure ?? "").trimmingCharacters(in: .whitespaces)
+        if amt.isEmpty || unit.isEmpty {
+            let parts: [String] = [
+                amt.isEmpty ? "Amount" : nil,
+                unit.isEmpty ? "Unit" : nil,
+            ].compactMap { $0 }
+            LabeledContent("Amount / Container") {
+                Text("Missing \(parts.joined(separator: " & "))")
+                    .italic()
+                    .foregroundStyle(.orange)
+            }
+            .listRowBackground(Color.orange.opacity(0.12))
+        } else {
+            LabeledContent("Amount / Container", value: "\(amt) \(unit)")
+        }
+    }
+
+    /// Render a labelled row.
+    /// - Optional fields are hidden when empty (matches the web `<Field>` helper).
+    /// - Required fields always render: present value normally, missing value
+    ///   with a yellow row background and an italic "Missing" placeholder so
+    ///   the user can see exactly which field needs attention and where it lives.
+    @ViewBuilder
+    private func row(_ label: String, _ value: String?, required: Bool = false) -> some View {
+        let trimmed = (value ?? "").trimmingCharacters(in: .whitespaces)
+        if !trimmed.isEmpty {
+            LabeledContent(label, value: trimmed)
+        } else if required {
+            LabeledContent(label) {
+                Text("Missing")
+                    .italic()
+                    .foregroundStyle(.orange)
+            }
+            .listRowBackground(Color.orange.opacity(0.12))
+        }
+    }
 }
diff --git a/LabWise/ChemicalsListView.swift b/LabWise/ChemicalsListView.swift
index e2b3b81..7d40ef7 100644
--- a/LabWise/ChemicalsListView.swift
+++ b/LabWise/ChemicalsListView.swift
@@ -9,14 +9,23 @@ struct ChemicalRowView: View {
     var body: some View {
         VStack(alignment: .leading, spacing: 4) {
             HStack {
-                Text(chemical.chemicalName)
+                Text(chemical.displayName)
                     .font(.headline)
                 Spacer()
-                PhysicalStateBadge(state: chemical.physicalState)
+                if let state = chemical.physicalState, !state.isEmpty {
+                    PhysicalStateBadge(state: state)
+                }
+            }
+            HStack(spacing: 6) {
+                if let cas = chemical.casNumber, !cas.isEmpty {
+                    Text("CAS: \(cas)")
+                        .font(.caption)
+                        .foregroundStyle(.secondary)
+                }
+                if chemical.isMissingKeyInfo {
+                    MissingInfoBadge()
+                }
             }
-            Text("CAS: \(chemical.casNumber)")
-                .font(.caption)
-                .foregroundStyle(.secondary)
             if let pct = chemical.percentageFull {
                 PercentageBar(value: pct / 100)
                     .frame(height: 4)
@@ -52,6 +61,25 @@ struct PhysicalStateBadge: View {
     }
 }
 
+// MARK: - Missing info badge
+
+/// Mirrors the web "Missing info" pill — amber, with a warning glyph.
+struct MissingInfoBadge: View {
+    var body: some View {
+        HStack(spacing: 3) {
+            Image(systemName: "exclamationmark.triangle.fill")
+                .font(.caption2)
+            Text("Missing info")
+                .font(.caption2.weight(.semibold))
+        }
+        .padding(.horizontal, 6)
+        .padding(.vertical, 2)
+        .background(Color.orange.opacity(0.15))
+        .foregroundStyle(Color.orange)
+        .clipShape(Capsule())
+    }
+}
+
 // MARK: - Percentage bar
 
 struct PercentageBar: View {
diff --git a/LabWise/DashboardView.swift b/LabWise/DashboardView.swift
index b34f4b0..142822c 100644
--- a/LabWise/DashboardView.swift
+++ b/LabWise/DashboardView.swift
@@ -215,13 +215,13 @@ private struct SafetyAlertsSection: View {
                 VStack(spacing: 8) {
                     ForEach(expired) { chem in
                         AlertRow(
-                            message: "\(chem.chemicalName) expired \(-viewModel.daysUntil(chem.expirationDate ?? ""))d ago — verify disposal",
+                            message: "\(chem.displayName) expired \(-viewModel.daysUntil(chem.expirationDate ?? ""))d ago — verify disposal",
                             severity: .critical
                         )
                     }
                     ForEach(lowStockAlerts) { chem in
                         AlertRow(
-                            message: "\(chem.chemicalName) is \(Int(chem.percentageFull ?? 0))% full — consider reordering",
+                            message: "\(chem.displayName) is \(Int(chem.percentageFull ?? 0))% full — consider reordering",
                             severity: .warning
                         )
                     }
@@ -275,8 +275,8 @@ private struct LowStockSection: View {
                 VStack(spacing: 0) {
                     ForEach(viewModel.lowStock.prefix(3)) { chem in
                         ChemAlertRow(
-                            name: chem.chemicalName,
-                            subtitle: "\(chem.lab) · \(chem.storageLocation)",
+                            name: chem.displayName,
+                            subtitle: "\(chem.lab ?? "—") · \(chem.storageLocation ?? "—")",
                             badge: "\(Int(chem.percentageFull ?? 0))% full",
                             badgeColor: .orange
                         )
@@ -304,8 +304,8 @@ private struct ExpiringSection: View {
                     ForEach(viewModel.expiringSoon.prefix(4)) { chem in
                         let days = viewModel.daysUntil(chem.expirationDate ?? "")
                         ChemAlertRow(
-                            name: chem.chemicalName,
-                            subtitle: "\(chem.lab) · \(chem.storageLocation)",
+                            name: chem.displayName,
+                            subtitle: "\(chem.lab ?? "—") · \(chem.storageLocation ?? "—")",
                             badge: days <= 0 ? "Expired \(-days)d ago" : "In \(days)d",
                             badgeColor: days <= 0 ? .red : .orange
                         )
@@ -336,7 +336,7 @@ private struct RecentActivitySection: View {
                                 .foregroundStyle(Color(.brandPrimary))
                                 .font(.title3)
                             VStack(alignment: .leading, spacing: 2) {
-                                Text("Added \(chem.chemicalName) to inventory")
+                                Text("Added \(chem.displayName) to inventory")
                                     .font(.subheadline)
                                     .lineLimit(1)
                                 Text(viewModel.relativeTime(chem.createdAt))
diff --git a/LabWise/InventoryView.swift b/LabWise/InventoryView.swift
index 51ff921..b994712 100644
--- a/LabWise/InventoryView.swift
+++ b/LabWise/InventoryView.swift
@@ -7,6 +7,10 @@ final class InventoryViewModel {
     var isLoading = false
     var errorMessage: String?
 
+    var missingInfoCount: Int {
+        chemicals.filter(\.isMissingKeyInfo).count
+    }
+
     private let client = ChemicalsClient()
 
     func loadChemicals() async {
@@ -73,6 +77,12 @@ struct InventoryView: View {
                     }
                 } else {
                     List {
+                        if viewModel.missingInfoCount > 0 && !isSelectMode {
+                            Section {
+                                MissingInfoBanner(count: viewModel.missingInfoCount)
+                            }
+                            .listRowBackground(Color.orange.opacity(0.08))
+                        }
                         ForEach(viewModel.chemicals) { chemical in
                             if isSelectMode {
                                 Button {
@@ -204,3 +214,27 @@ struct InventoryView: View {
         }
     }
 }
+
+// MARK: - Missing-info banner
+
+/// Shown above the inventory list when one or more rows are missing required
+/// fields (typically the result of a web spreadsheet import). Mirrors the
+/// amber banner on the web inventory page.
+private struct MissingInfoBanner: View {
+    let count: Int
+
+    var body: some View {
+        HStack(alignment: .top, spacing: 10) {
+            Image(systemName: "exclamationmark.triangle.fill")
+                .foregroundStyle(.orange)
+            VStack(alignment: .leading, spacing: 2) {
+                Text("Missing Key Information")
+                    .font(.subheadline.weight(.semibold))
+                Text("\(count) \(count == 1 ? "item is" : "items are") missing required fields. Tap an item flagged with “Missing info” to see exactly which fields and edit them.")
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+            }
+        }
+        .padding(.vertical, 4)
+    }
+}
diff --git a/LabWise/SpreadsheetView.swift b/LabWise/SpreadsheetView.swift
index 1574fe7..0a13e2b 100644
--- a/LabWise/SpreadsheetView.swift
+++ b/LabWise/SpreadsheetView.swift
@@ -12,17 +12,17 @@ struct SpreadsheetView: View {
     }
 
     private static let columnDefs: [ColumnDef] = [
-        ColumnDef(label: "PI First Name",       width: 130) { $0.piFirstName },
-        ColumnDef(label: "Physical State",       width: 120) { $0.physicalState },
-        ColumnDef(label: "Chemical Name",        width: 180) { $0.chemicalName },
-        ColumnDef(label: "Bldg Code",            width: 100) { $0.bldgCode },
-        ColumnDef(label: "LAB",                  width: 80)  { $0.lab },
-        ColumnDef(label: "Storage Location",     width: 145) { $0.storageLocation },
-        ColumnDef(label: "Storage Device",       width: 140) { $0.storageDevice },
-        ColumnDef(label: "# of Containers",      width: 120) { $0.numberOfContainers },
-        ColumnDef(label: "Amount / Container",   width: 150) { $0.amountPerContainer },
-        ColumnDef(label: "Unit of Measure",      width: 130) { $0.unitOfMeasure },
-        ColumnDef(label: "CAS #",                width: 115) { $0.casNumber },
+        ColumnDef(label: "PI First Name",       width: 130) { $0.piFirstName ?? "" },
+        ColumnDef(label: "Physical State",       width: 120) { $0.physicalState ?? "" },
+        ColumnDef(label: "Chemical Name",        width: 180) { $0.chemicalName ?? "" },
+        ColumnDef(label: "Bldg Code",            width: 100) { $0.bldgCode ?? "" },
+        ColumnDef(label: "LAB",                  width: 80)  { $0.lab ?? "" },
+        ColumnDef(label: "Storage Location",     width: 145) { $0.storageLocation ?? "" },
+        ColumnDef(label: "Storage Device",       width: 140) { $0.storageDevice ?? "" },
+        ColumnDef(label: "# of Containers",      width: 120) { $0.numberOfContainers ?? "" },
+        ColumnDef(label: "Amount / Container",   width: 150) { $0.amountPerContainer ?? "" },
+        ColumnDef(label: "Unit of Measure",      width: 130) { $0.unitOfMeasure ?? "" },
+        ColumnDef(label: "CAS #",                width: 115) { $0.casNumber ?? "" },
         ColumnDef(label: "Chemical Formula",     width: 140) { $0.chemicalFormula ?? "" },
         ColumnDef(label: "Molecular Weight",     width: 130) { $0.molecularWeight ?? "" },
         ColumnDef(label: "Vendor",               width: 130) { $0.vendor ?? "" },
diff --git a/LabWiseKit/Sources/LabWiseKit/Models/Chemical.swift b/LabWiseKit/Sources/LabWiseKit/Models/Chemical.swift
index 6008b7c..d63f971 100644
--- a/LabWiseKit/Sources/LabWiseKit/Models/Chemical.swift
+++ b/LabWiseKit/Sources/LabWiseKit/Models/Chemical.swift
@@ -2,17 +2,20 @@ import Foundation
 
 public struct Chemical: Identifiable, Sendable, Encodable {
     public let id: String
-    public var piFirstName: String
-    public var physicalState: String
-    public var chemicalName: String
-    public var bldgCode: String
-    public var lab: String
-    public var storageLocation: String
-    public var storageDevice: String
-    public var numberOfContainers: String
-    public var amountPerContainer: String
-    public var unitOfMeasure: String
-    public var casNumber: String
+    // These eleven fields are nullable on the server (rows imported from spreadsheets
+    // can leave any of them blank). Treat them as optional everywhere on read; the
+    // Add/Edit form still validates them as required on write.
+    public var piFirstName: String?
+    public var physicalState: String?
+    public var chemicalName: String?
+    public var bldgCode: String?
+    public var lab: String?
+    public var storageLocation: String?
+    public var storageDevice: String?
+    public var numberOfContainers: String?
+    public var amountPerContainer: String?
+    public var unitOfMeasure: String?
+    public var casNumber: String?
     public var chemicalFormula: String?
     public var molecularWeight: String?
     public var vendor: String?
@@ -31,17 +34,17 @@ public struct Chemical: Identifiable, Sendable, Encodable {
 
     public init(
         id: String = "",
-        piFirstName: String = "",
-        physicalState: String = "",
-        chemicalName: String = "",
-        bldgCode: String = "",
-        lab: String = "",
-        storageLocation: String = "",
-        storageDevice: String = "",
-        numberOfContainers: String = "",
-        amountPerContainer: String = "",
-        unitOfMeasure: String = "",
-        casNumber: String = "",
+        piFirstName: String? = nil,
+        physicalState: String? = nil,
+        chemicalName: String? = nil,
+        bldgCode: String? = nil,
+        lab: String? = nil,
+        storageLocation: String? = nil,
+        storageDevice: String? = nil,
+        numberOfContainers: String? = nil,
+        amountPerContainer: String? = nil,
+        unitOfMeasure: String? = nil,
+        casNumber: String? = nil,
         chemicalFormula: String? = nil,
         molecularWeight: String? = nil,
         vendor: String? = nil,
@@ -92,17 +95,17 @@ extension Chemical: Decodable {
     public init(from decoder: Decoder) throws {
         let c = try decoder.container(keyedBy: CodingKeys.self)
         id                 = try c.decode(String.self, forKey: .id)
-        piFirstName        = try c.decode(String.self, forKey: .piFirstName)
-        physicalState      = try c.decode(String.self, forKey: .physicalState)
-        chemicalName       = try c.decode(String.self, forKey: .chemicalName)
-        bldgCode           = try c.decode(String.self, forKey: .bldgCode)
-        lab                = try c.decode(String.self, forKey: .lab)
-        storageLocation    = try c.decode(String.self, forKey: .storageLocation)
-        storageDevice      = try c.decode(String.self, forKey: .storageDevice)
-        numberOfContainers = try c.decode(String.self, forKey: .numberOfContainers)
-        amountPerContainer = try c.decode(String.self, forKey: .amountPerContainer)
-        unitOfMeasure      = try c.decode(String.self, forKey: .unitOfMeasure)
-        casNumber          = try c.decode(String.self, forKey: .casNumber)
+        piFirstName        = try c.decodeIfPresent(String.self, forKey: .piFirstName)
+        physicalState      = try c.decodeIfPresent(String.self, forKey: .physicalState)
+        chemicalName       = try c.decodeIfPresent(String.self, forKey: .chemicalName)
+        bldgCode           = try c.decodeIfPresent(String.self, forKey: .bldgCode)
+        lab                = try c.decodeIfPresent(String.self, forKey: .lab)
+        storageLocation    = try c.decodeIfPresent(String.self, forKey: .storageLocation)
+        storageDevice      = try c.decodeIfPresent(String.self, forKey: .storageDevice)
+        numberOfContainers = try c.decodeIfPresent(String.self, forKey: .numberOfContainers)
+        amountPerContainer = try c.decodeIfPresent(String.self, forKey: .amountPerContainer)
+        unitOfMeasure      = try c.decodeIfPresent(String.self, forKey: .unitOfMeasure)
+        casNumber          = try c.decodeIfPresent(String.self, forKey: .casNumber)
         chemicalFormula    = try c.decodeIfPresent(String.self, forKey: .chemicalFormula)
         molecularWeight    = try c.decodeIfPresent(String.self, forKey: .molecularWeight)
         vendor             = try c.decodeIfPresent(String.self, forKey: .vendor)
@@ -145,6 +148,38 @@ extension Chemical: Decodable {
     }
 }
 
+/// The eleven fields the web app treats as "key information." A row missing any
+/// of these is flagged with a Missing-info badge in the inventory list.
+public extension Chemical {
+    /// Names of the required fields whose value is missing or whitespace-only.
+    /// Order matches the visual order in the iOS Add/Edit form so the
+    /// "Missing: …" banner reads top-to-bottom in the same order the user fills.
+    var missingFields: [String] {
+        func empty(_ s: String?) -> Bool { (s ?? "").trimmingCharacters(in: .whitespaces).isEmpty }
+        var out: [String] = []
+        if empty(chemicalName)       { out.append("Chemical Name") }
+        if empty(casNumber)          { out.append("CAS #") }
+        if empty(physicalState)      { out.append("Physical State") }
+        if empty(storageDevice)      { out.append("Storage Device") }
+        if empty(piFirstName)        { out.append("PI First Name") }
+        if empty(bldgCode)           { out.append("Building Code") }
+        if empty(lab)                { out.append("Lab") }
+        if empty(storageLocation)    { out.append("Storage Location") }
+        if empty(numberOfContainers) { out.append("# of Containers") }
+        if empty(amountPerContainer) { out.append("Amount / Container") }
+        if empty(unitOfMeasure)      { out.append("Unit of Measure") }
+        return out
+    }
+
+    var isMissingKeyInfo: Bool { !missingFields.isEmpty }
+
+    /// Best-effort display name; falls back when `chemicalName` is missing.
+    var displayName: String {
+        let trimmed = (chemicalName ?? "").trimmingCharacters(in: .whitespaces)
+        return trimmed.isEmpty ? "Unnamed chemical" : trimmed
+    }
+}
+
 public struct ChemicalCreateBody: Codable, Sendable {
     public var piFirstName: String
     public var physicalState: String