diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 83e3201..ea1c1d1 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -13,8 +13,8 @@ android {
         applicationId = "com.iiyh.emoneyinfo"
         minSdk = 28
         targetSdk = 36
-        versionCode = 3
-        versionName = "1.0.1"
+        versionCode = 4
+        versionName = "1.0.2"
 
         vectorDrawables {
             useSupportLibrary = true
diff --git a/app/src/main/java/com/iiyh/emoneyinfo/data/Models.kt b/app/src/main/java/com/iiyh/emoneyinfo/data/Models.kt
index 749a871..58d36d4 100644
--- a/app/src/main/java/com/iiyh/emoneyinfo/data/Models.kt
+++ b/app/src/main/java/com/iiyh/emoneyinfo/data/Models.kt
@@ -44,6 +44,18 @@ data class TransactionItem(
             append(locationName)
         }
     }
+
+    fun historyKey(): String = buildString {
+        append(date.time / 1000)
+        append('|')
+        append(amount)
+        append('|')
+        append(if (isCredit) 1 else 0)
+        append('|')
+        append(locationName.trim())
+        append('|')
+        append(title)
+    }
 }
 
 data class EmoneyUiState(
@@ -63,6 +75,16 @@ data class EmoneyUiState(
     }
 
     fun hasCardData(): Boolean = cardType != CardType.UNKNOWN || cardNumber.isNotBlank() || balance > 0 || transactions.isNotEmpty()
+
+    fun clearingHistory(scanMessage: String): EmoneyUiState = copy(
+        transactions = emptyList(),
+        scanMessage = scanMessage
+    )
+
+    fun deduplicatingHistory(): EmoneyUiState {
+        val deduplicated = transactions.distinctBy { it.historyKey() }
+        return if (deduplicated.size == transactions.size) this else copy(transactions = deduplicated)
+    }
 }
 
 fun String.formatCardNumber(): String {
diff --git a/app/src/main/java/com/iiyh/emoneyinfo/nfc/UnifiedNfcReader.kt b/app/src/main/java/com/iiyh/emoneyinfo/nfc/UnifiedNfcReader.kt
index 9c0ad7f..6ef5cc1 100644
--- a/app/src/main/java/com/iiyh/emoneyinfo/nfc/UnifiedNfcReader.kt
+++ b/app/src/main/java/com/iiyh/emoneyinfo/nfc/UnifiedNfcReader.kt
@@ -51,7 +51,8 @@ class UnifiedNfcReader(private val context: Context) {
     }
 
     fun startScan() {
-        refreshStatus()
+        resetMessageJob?.cancel()
+        _uiState.value = _uiState.value.clearingHistory(currentScanMessage())
     }
 
     fun onNewIntent(intent: Intent) {
@@ -65,7 +66,7 @@ class UnifiedNfcReader(private val context: Context) {
         AppLog.d("EmoneyInfoNfc", "onNewIntent techs=${tag.techList.joinToString()}")
         val reader = readers.firstOrNull { it.canHandle(tag) } ?: return
         runCatching {
-            _uiState.value = reader.read(tag, strings)
+            _uiState.value = reader.read(tag, strings).deduplicatingHistory()
             scheduleResetToRescanHint()
         }.onFailure {
             AppLog.e("EmoneyInfoNfc", "Scan failed: ${it.message}", it)
diff --git a/app/src/main/java/com/iiyh/emoneyinfo/ui/EmoneyInfoApp.kt b/app/src/main/java/com/iiyh/emoneyinfo/ui/EmoneyInfoApp.kt
index 4feb8fb..cbac3f2 100644
--- a/app/src/main/java/com/iiyh/emoneyinfo/ui/EmoneyInfoApp.kt
+++ b/app/src/main/java/com/iiyh/emoneyinfo/ui/EmoneyInfoApp.kt
@@ -95,7 +95,11 @@ fun EmoneyInfoApp(
                     adsEnabled = adsEnabled,
                     showCardNumber = showCardNumber,
                     onScanTapped = { nfcReader.startScan() },
-                    onViewHistoryTapped = { navController.navigate("history") },
+                    onViewHistoryTapped = {
+                        if (uiState.transactions.isNotEmpty()) {
+                            navController.navigate("history")
+                        }
+                    },
                     onSettingsTapped = { navController.navigate("settings") }
                 )
             }
diff --git a/app/src/main/java/com/iiyh/emoneyinfo/ui/screens/HomeScreen.kt b/app/src/main/java/com/iiyh/emoneyinfo/ui/screens/HomeScreen.kt
index ea6c908..843df06 100644
--- a/app/src/main/java/com/iiyh/emoneyinfo/ui/screens/HomeScreen.kt
+++ b/app/src/main/java/com/iiyh/emoneyinfo/ui/screens/HomeScreen.kt
@@ -2,6 +2,7 @@ package com.iiyh.emoneyinfo.ui.screens
 
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.layout.Box
@@ -70,6 +71,7 @@ fun HomeScreen(
     val clipboard = LocalClipboardManager.current
     val context = LocalContext.current
     val latestTransaction = state.transactions.firstOrNull()
+    val hasHistory = state.transactions.isNotEmpty()
     val hasCardData = state.hasCardData()
     val displayCardNumber = when {
         state.cardNumber.isBlank() -> ""
@@ -288,6 +290,7 @@ fun HomeScreen(
             modifier = Modifier
                 .fillMaxWidth()
                 .clickable(
+                    enabled = hasHistory,
                     interactionSource = remember { MutableInteractionSource() },
                     indication = null,
                     onClick = onViewHistoryTapped
@@ -295,8 +298,17 @@ fun HomeScreen(
             verticalAlignment = Alignment.CenterVertically,
             horizontalArrangement = Arrangement.spacedBy(8.dp)
         ) {
-            Icon(Icons.Default.History, contentDescription = null)
-            Text(stringResource(R.string.view_full_history), fontWeight = FontWeight.SemiBold)
+            val historyColor = if (hasHistory) {
+                MaterialTheme.colorScheme.primary
+            } else {
+                TextSecondary.copy(alpha = if (isSystemInDarkTheme()) 0.7f else 0.4f)
+            }
+            Icon(Icons.Default.History, contentDescription = null, tint = historyColor)
+            Text(
+                stringResource(R.string.view_full_history),
+                fontWeight = FontWeight.SemiBold,
+                color = historyColor
+            )
         }
     }
 }