At first nothing grew. I figured there wasn't enough alum in the solution. But little by little I added more crystals and let the water in the cup evaporate.
Then the other day, I glanced in the cup and saw these, lying on the bottom:
Without the food coloring, they look like diamonds waiting to be put in rings. So cool! All the crystals are flat on the bottom, though. I tied one on a string to see if it would grow, and if it would even out on the flat side. Updates in a few days.
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