diff --git a/CHECKLIST.md b/CHECKLIST.md
index 0261d2d4..78e08e32 100644
--- a/CHECKLIST.md
+++ b/CHECKLIST.md
@@ -54,3 +54,10 @@ This is a list of items and transitions to check to ensure everything is correct
 * [Hand Cart](https://onetech.info/484-Hand-Cart/recipe): 1 log, wooden disks
 * [Running Crude Car](https://onetech.info/2396-Running-Crude-Car/recipe): 5 yew branches
 * [Cistern](https://onetech.info/672-Cistern/recipe): 10 stones
+
+
+### Tinted sprites
+
+* [Glass Bottle](https://twotech.twohoursonelife.com/3338-Glass-Bottle): it should not be white
+* [Floor Blueprint](https://twotech.twohoursonelife.com/14064-Floor-Blueprint): should appear blue
+* [Green Linen Top](https://twotech.twohoursonelife.com/14730-Green-Linen-Top): should appear green
diff --git a/process/src/SpriteProcessor.js b/process/src/SpriteProcessor.js
index a8faad57..ca81698a 100644
--- a/process/src/SpriteProcessor.js
+++ b/process/src/SpriteProcessor.js
@@ -119,7 +119,7 @@ class SpriteProcessor {
   drawSpriteDirectly(sprite, context) {
     this.drawSpriteImage(sprite, context);
 
-    if (sprite.color.find(c => c < 1.0)) {
+    if (sprite.color.find(c => c < 1.0) !== undefined) {
       this.overlayColor(sprite, context)
     }
   }