First off, let me just say – this stuff is WILD. I've played around with multiple color-changing pigments (Yellow-Red @59°, Red-Yellow @77°, Black-Clear @77°), and each one brings its own little magic trick to the table.

The Red-Clear @88° mixed into epoxy resin? Absolutely stunning. Poured it into a knife handle project, and when that vibrant red appears... chef's kiss. Though PSA: powder doesn't turn fully clear – more like a frosty translucent white. My winter fingers couldn't activate the 88°F change though – save those for summer projects!

Rainy day win: Mixed Yellow-Red @59° into nail polish with my kid. Instant hit! Changes color just from finger warmth, and safe for skin contact (though obviously not for eating). The Black-Pink? Meh. Got dark purple instead of pink – might need hotter temps than hands provide.

Pro tips: Works best on light surfaces (that 'black' is really dark grey), activates faster with higher temp pigments (82°F changes quicker than 77°F), and ALWAYS put something under your workspace – this powder gets everywhere during mixing!

While not perfect (wish some colors showed more dramatic changes), this opens up SO many creative possibilities – from science experiments to jewelry making. Just mind those activation temperatures for your specific project needs!