diff --git a/BestiaryUI.cs b/BestiaryUI.cs
index db22e47..974bcb3 100644
--- a/BestiaryUI.cs
+++ b/BestiaryUI.cs
@@ -213,6 +213,10 @@ private int CustomSort(UIElement x, UIElement y) {
 			return x.CompareTo(y);
 		}
 
+		/// <summary>
+		/// Validates the NPC-name filter against all loaded NPC names.
+		/// If no match is found, removes the last character and triggers a blink to indicate invalid input.
+		/// </summary>
 		private void ValidateNPCFilter()
 		{
 			if (npcNameFilter.currentString.Length > 0)
@@ -231,6 +235,7 @@ private void ValidateNPCFilter()
 				if (!found)
 				{
 					npcNameFilter.SetText(npcNameFilter.currentString.Substring(0, npcNameFilter.currentString.Length - 1));
+					npcNameFilter.TriggerInvalidBlink();
 				}
 			}
 			updateNeeded = true;
@@ -383,4 +388,4 @@ private void ItemChecklistNewLootOnlyFilter_SelectedChanged(object sender, Event
 			updateNeeded = true;
 		}
 	}
-}
\ No newline at end of file
+}
diff --git a/ItemCatalogueUI.cs b/ItemCatalogueUI.cs
index a366fa5..8fe9d0f 100644
--- a/ItemCatalogueUI.cs
+++ b/ItemCatalogueUI.cs
@@ -217,6 +217,10 @@ private void UnobtainedRadioButton_OnSelectedChanged(object sender, EventArgs e)
 			updateNeeded = true;
 		}
 
+		/// <summary>
+		/// Validates the item-name filter against all item slots.
+		/// If no match is found, removes the last character and triggers a blink to indicate invalid input.
+		/// </summary>
 		private void ValidateItemFilter()
 		{
 			if (itemNameFilter.currentString.Length > 0)
@@ -233,13 +237,38 @@ private void ValidateItemFilter()
 				if (!found)
 				{
 					itemNameFilter.SetText(itemNameFilter.currentString.Substring(0, itemNameFilter.currentString.Length - 1));
+					itemNameFilter.TriggerInvalidBlink();
 				}
 			}
 			updateNeeded = true;
 		}
 
+		/// <summary>
+		/// Validates the item-description filter against all item slot tooltips.
+		/// If no match is found, removes the last character and triggers a blink to indicate invalid input.
+		/// </summary>
 		private void ValidateItemDescription()
 		{
+			if (itemDescriptionFilter.currentString.Length > 0)
+			{
+				bool found = false;
+				
+				foreach (var itemSlot in itemSlots)
+				{
+					if (itemSlot.item.ToolTip != null && GetTooltipsAsString(itemSlot.item.ToolTip).IndexOf(itemDescriptionFilter.currentString, StringComparison.OrdinalIgnoreCase) != -1)
+					{
+						found = true;
+						break;
+					}
+				}
+				
+				if (!found)
+				{
+					itemDescriptionFilter.SetText(itemDescriptionFilter.currentString.Substring(0, itemDescriptionFilter.currentString.Length - 1));
+					itemDescriptionFilter.TriggerInvalidBlink();
+				}
+			}
+			
 			updateNeeded = true;
 		}
 
@@ -519,4 +548,4 @@ public override void RecalculateChildren()
 			base.RecalculateChildren();
 		}
 	}
-}
\ No newline at end of file
+}
diff --git a/RecipeCatalogueUI.cs b/RecipeCatalogueUI.cs
index c11ebae..dad0ccd 100644
--- a/RecipeCatalogueUI.cs
+++ b/RecipeCatalogueUI.cs
@@ -878,7 +878,8 @@ private void ItemChecklistFilter_SelectedChanged(object sender, EventArgs e)
 		}
 
 		/// <summary>
-		/// Checks text to verify input is in
+		/// Validates the item-name filter against recipe outputs.
+		/// If no match is found, removes the last character and triggers a blink to indicate invalid input.
 		/// </summary>
 		private void ValidateItemFilter()
 		{
@@ -897,30 +898,39 @@ private void ValidateItemFilter()
 				if (!found)
 				{
 					itemNameFilter.SetText(itemNameFilter.currentString.Substring(0, itemNameFilter.currentString.Length - 1));
+					itemNameFilter.TriggerInvalidBlink();
 				}
 			}
 			updateNeeded = true;
 		}
 
+		/// <summary>
+		/// Validates the item-description filter against recipe tooltips.
+		/// If no match is found, removes the last character and triggers a blink to indicate invalid input.
+		/// </summary>
 		private void ValidateItemDescription()
 		{
-			//if (itemNameFilter.Text.Length > 0)
-			//{
-			//	bool found = false;
-			//	for (int i = 0; i < Recipe.numRecipes; i++)
-			//	{
-			//		Recipe recipe = Main.recipe[i];
-			//		if (recipe.createItem.name.ToLower().IndexOf(itemNameFilter.Text, StringComparison.OrdinalIgnoreCase) == -1)
-			//		{
-			//			found = true;
-			//			break;
-			//		}
-			//	}
-			//	if (!found)
-			//	{
-			//		itemNameFilter.SetText(itemNameFilter.Text.Substring(0, itemNameFilter.Text.Length - 1));
-			//	}
-			//}
+			if (itemDescriptionFilter.currentString.Length > 0)
+			{
+				bool found = false;
+				
+				for (int i = 0; i < Recipe.numRecipes; i++)
+				{
+					Recipe recipe = Main.recipe[i];
+					if (recipe.createItem.ToolTip != null && GetTooltipsAsString(recipe.createItem.ToolTip).IndexOf(itemDescriptionFilter.currentString, StringComparison.OrdinalIgnoreCase) != -1)
+					{
+						found = true;
+						break;
+					}
+				}
+				
+				if (!found)
+				{
+					itemDescriptionFilter.SetText(itemDescriptionFilter.currentString.Substring(0, itemDescriptionFilter.currentString.Length - 1));
+					itemDescriptionFilter.TriggerInvalidBlink();
+				}
+			}
+			
 			updateNeeded = true;
 		}
 
@@ -948,4 +958,4 @@ internal void InvalidateExtendedCraft()
 				SharedUI.instance.ObtainableFilter.button.LeftClick(new UIMouseEvent(null, Vector2.Zero));
 		}
 	}
-}
\ No newline at end of file
+}
diff --git a/UIElements/NewUITextBox.cs b/UIElements/NewUITextBox.cs
index 205e67f..e4df24d 100644
--- a/UIElements/NewUITextBox.cs
+++ b/UIElements/NewUITextBox.cs
@@ -25,6 +25,15 @@ internal class NewUITextBox : UIPanel//UITextPanel<string>
 		private int textBlinkerCount;
 		private int textBlinkerState;
 
+		private const int BlinkIntervalFrames = 20; // frames between blink state changes
+		private const int TotalBlinks = 4; // 4 state changes = 2 full blinks
+		private int _remainingBlinkSteps; // remaining blink state changes
+		private int _blinkTimer; // frame countdown until next state change
+		private bool _blinkState; // true when currently in blink state
+
+		private readonly Color _defaultBorderColor;
+		private readonly Color _defaultBackgroundColor;
+
 		public event Action OnFocus;
 
 		public event Action OnUnfocus;
@@ -48,6 +57,8 @@ public NewUITextBox(string hintText, string text = "")
 			SetPadding(0);
 			BackgroundColor = Color.White;
 			BorderColor = Color.White;
+			_defaultBackgroundColor = BackgroundColor;
+			_defaultBorderColor = BorderColor;
 			//			keyBoardInput.newKeyEvent += KeyboardInput_newKeyEvent;
 
 			var closeButton = new UIHoverImageButton(CloseButtonTexture, "");
@@ -206,10 +217,40 @@ private static bool JustPressed(Keys key)
 			return Main.inputText.IsKeyDown(key) && !Main.oldInputText.IsKeyDown(key);
 		}
 
+		/// <summary>
+		/// Triggers the blink animation when the filter yields no matches.
+		/// </summary>
+		public void TriggerInvalidBlink()
+		{
+			_remainingBlinkSteps = TotalBlinks;
+			_blinkTimer = BlinkIntervalFrames;
+			_blinkState = true;
+		}
+
 		protected override void DrawSelf(SpriteBatch spriteBatch)
 		{
 			Rectangle hitbox = GetInnerDimensions().ToRectangle();
 
+			// handle blink timing and state
+			if (_remainingBlinkSteps > 0)
+			{
+				_blinkTimer--;
+				if (_blinkTimer <= 0)
+				{
+					_blinkTimer = BlinkIntervalFrames;
+					_blinkState = !_blinkState;
+					_remainingBlinkSteps--;
+				}
+			}
+
+			// apply blink colors if active, otherwise use defaults
+			BorderColor = (_remainingBlinkSteps > 0 && _blinkState)
+				? new Color(255, 0, 0)
+				: _defaultBorderColor;
+			BackgroundColor = (_remainingBlinkSteps > 0 && _blinkState)
+				? new Color(255, 107, 107)
+				: _defaultBackgroundColor;
+
 			// Draw panel
 			base.DrawSelf(spriteBatch);
 			//	Main.spriteBatch.Draw(Main.magicPixel, hitbox, Color.Yellow);
@@ -331,4 +372,4 @@ protected override void DrawSelf(SpriteBatch spriteBatch)
 			//			Utils.DrawBorderString(spriteBatch, "|", pos, base.TextColor, base.TextScale, 0f, 0f, -1);
 		}
 	}
-}
\ No newline at end of file
+}