Repeat after me: No Science Kits.

Trying to imagine why the person who created this pre-packed crystal growing kit for children, which could of course contain any amount of powder, has you mix 2/3 of the powder (of which there is an unlabeled amount, so you definitely have to guess) with exactly 2.29 ounces of water (for which you provide your own measuring cup that’s accurate to the milliliter.
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“Don’t purchase kits from such garbage companies!” you might say. It’s made by the Smithsonian.