20g of Thermochromic Temperature Activated Pigment Powder - Heat Sensitive Color Changing Powder for Slime, Paint, Resin, Epoxy, Nail Polish, Ink, Screen Printing, Fabric Art, Casting (Black)

For my projects I tried mixing the pigment with gloss varnish and print ink extender. Both instances the pigment mixed very well with the mediums and reacted to temperature once dried. I was worried that it wouldn't react to a person's hand, but it did change color. Just be careful when working with the powder because it's very fine and easy to get everywhere if you're not careful. A little goes a long way!

I've had a bad batch before but overall it's a great product. The replacement for the bad bag was here in two days and worked . I have to use more pigment to binder ratio(1:1) than I originally was told (20:1) ...BUT I found this specific brand way better at becoming completely transparent more than some of the others on Amazon . I have bought the Black to colorless and the magenta to "colorless" . Black is perfect but magenta turns into light pink not clear. Like ever... No matter how much you mess with the ratios it never turns clear ,BUT it's still pretty .

A little disappointed the color is not as vibrant as in the pictures.

Most of the thermochromic powder (color changing with heat) I've gotten has been very similar, for all I know it all comes from the same factory.This is *31C (~88F)* color changing, meaning it will be black most of the time, but change to white (or clear, in liquid) under heat (body heat, hair dryer, etc). This is good for covering secret messages that reveal with heat.Applying the powder is a bit tricky. You have to mix it with some kind of clear binder base. You can get acrylic base, or just use clear-dry (Elmer's) glue of some kind. The powder doesn't "want" to mix, you're going to have to spend a minute beating each batch into the base. You'll need to experiment with the right ratio, but start with something like 1:8 (powder to base, by volume) and adjust to minimize powder consumption while still applying in an opaque coat.It's also available in other temperature-thresholds (instead of 31C) and colors (instead of black-to-clear). While this worked OK, for use on paper I found it inferior to a proper thermochromic *ink* as made by Atlanta Chemical. Your mileage may vary!

I never knew this powder existed and now I want to put it in everything. My niece and I made slime and it went splendidly! It was a definite upgrade for the slime and made for a fun science experiment feel. We've made two batches and there's still so much powder left.

The product worked while in closed package but once I opened it, it no longer worked. I went ahead and put some in my epoxy and applied it to a stainless steel cup allowed it to dry and even still it did not work. I did not use until yesterday and now its to late to return

Well since the day was so hot with this summer heat I didn't see much of a color change removing it from the package. So I took a frozen bottle of water and set it on the package and the color change happened. It is a good product will be buying more.

This powder works in resin casting/epoxy. The color difference is noticeable and the color is as described. Not sure why people complained about the size of the product. A little goes a long way. I used 1/8 teaspoon of powder in 60ml of epoxy mixture and got 4 keychains and a set of earrings.