I dont think its code You just have to cool it or heat it for it to change colors
To answer kits question, pretty pictures have broad appeal. Tutorials for specific things are only appealing to an equally specific audience. Since FP is based on the number of upvotes instead of save quality or effort, saves with more broad appeal will end up here while niche saves generally won't.
best thing to check how many did you use wifi +1
legit clicked on this and wondered why and how my screen broke in a rainbow fassion. +1