Some crystals look very similar but here are a couple of ways to tell them apart. The salt may look a little grayer than the sugar which may look whiter than the salt. The alum may sparkle a little ...

but this isn’t always necessary (in our experiment, we dug our crystals out with a fork). We used Epsom salt, but you can use other solids, including table salt or sugar. These will each behave ...

Try the experiment with just one color and you’ll see that dark felt-tipped pens are made up of a surprising number of different colors! If the wet ink is also sprinkled with salt, the salt crystals ...

This fun and tasty experiment ... enough to create those ice crystals without a freezer. Put lots of ice into the large zip-lock bag, then add 6 tablespoons of salt. The salt lowers the freezing ...