What you'll need
Find it links go to Amazon. As an Amazon Associate we earn from qualifying purchases. How we make money
How to make it
Epsom salt isn't a snack, so no tasting, and wash hands after.
1Pour the water
Grown-up step: run the tap as hot as it goes and fill the glass with 1/2 cup.
2Stir in the salt
Add the Epsom salt and stir for about 1 minute. Some grains may stay at the bottom. That's fine.
3Add color
Add 1 or 2 drops of food coloring and stir once.
4Chill it
Put the glass in the fridge overnight. Don't wiggle it.
5Check in the morning
Look for long needle crystals across the cup. Pour off the leftover water to see them.
6Talk about why
Hot water holds more dissolved salt than cold water. As it cools, the extra salt has to come out. It lines up into crystals as it leaves.
Edie's tipLook at the crystals with a magnifying glass. Every needle has flat sides.
Written by the DIY Project team. How we check · Report a mistake
