This is really cool but the price is ridiculous. And while it works well as an adhesive (not sure why you're doing that, although it's hard to see the coloring effect), it dries FOREVER if you're just using it as decoration. We didn't make any slime with it, but I think that's where this product shines. I had no problems with the color change and found the transition from light blue to deep purple to be quite dramatic and very quick. It was also a very bright sunny summer day in Southern California. I'm not sure what the effect would be in less than ideal conditions. It took a little longer for me to turn blue from purple again when I put it back in. I'm taking off a star because they claim it's good for decorating, but it actually dries so slowly that I can't recommend it for that, it's really only for making slime. If they want to charge that much, they should also include a slime activator and make a kit out of it. Because that's pretty much the point of this stuff.
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