I was super excited to try these thermochromic pigments for my resin jewelry projects. The color options sounded amazing – especially that Purple to Blue shift. Opening the tiny containers felt like uncovering secret potion ingredients!

First attempt: mixed a pinch of the Purple-to-Blue pigment into clear epoxy resin. The initial purple shade was gorgeous – deep and rich. But here's the thing... I waited, blew on it, even held it over warm water. That magical color change? Barely noticeable. Only when I pressed my (very warm) palm against it for a full minute did I get a faint bluish tint.

The powders work best in thin applications – I had better results painting them mixed with clear nail polish onto paper. The Green-to-Lime transition was actually visible when I breathed warm air onto it! Pro tip: These NEED direct, sustained heat to work – body temperature alone often isn't enough.

Biggest letdown? Several containers arrived with cracked lids (like other reviewers mentioned). I had to immediately transfer them to airtight jars to prevent spills. For $20, better packaging would be expected.

Final verdict? Cool for science experiments or crafts where you can apply strong heat sources, but don't expect dramatic Harry Potter-style color shifts from casual use. The vibrant base colors save this from being a total bust – they're gorgeous even without the thermal effects.