The powder is not identified in the instructions but is probably ammonium dihydrogen phosphate (aka monoammonium phosphate), since that’s how it was identified in another kit I have and the crystals look similar. Wikipedia identifies this as relatively non-toxic and not deliquescent (so it shouldn’t absorb moisture from the air and lose its crystalline form). The red and blue are just the same chemical, with dye added. Setup is straightforward. We weren’t able to get all of the powder to dissolve; there were a few fine grains left over no matter how much we stirred.Within about 12 hours, there were ~5mm crystals on the seed rock (glass blob covered with small crystals), as well as on the floor and walls of the container. After a couple of days, there were nice long crystals growing from the “seed” stone and shorter crystals on the floor of the container (from the leftover grains mentioned above). I should have taken them out after about a week, but made the mistake of waiting longer. Enough water evaporated to expose the tops of the crystals, and the exposed parts grew smaller crystals on them, giving a fuzzy appearance. Also, the crystals on the floor and walls of the container were now longer. You can see this in the photos. The photos also show that the blue and red dyes are unevenly and thinly distributed. I think the plain clear crystals look best.The display bases and dome covers look, in the product photos, like nice acrylic or similar. Instead, they’re thin plastic of the sort used in disposable food-service packaging. The clear lid fits onto the base but doesn’t snap shut.
The White Crystal worked wonderfully! Great fun! However, the other 2 colors bled just about everywhere and as well the crystalline structure was very fragile and did not grow UP, but SIDEWAYS.
They grew, but not as nicely as pictured. Not bad! See pic.
My 14 yo daughter enjoyed these, they are basic and not the best, but they are fun.The lids dont fit perfectly, but for the price its worth it
She loved it for her birthday