quart sized glass jar
½ cup warm water
2x8" half inch piece of dark construction paper
Add warm water to the jar.
Stir your salt into the water one spoonful at a time, until the water molecules are completely saturated with salt. You will be able to tell this when no more salt will dissolve and it starts to collect on the bottom.
Place the construction paper strip in the jar and let it sit for three weeks. Salt crystals will start to form on the paper as the water evaporates.
Choose a color for your crystals and add a couple drops of food coloring to the water!
Experiment with different environments for your crystals to grow. Try a shallow pie pan with a circular piece of construction paper.
You can also try to grow your crystals on objects like a piece of a kitchen sponge, or a paper clip suspended by string hanging from a pencil.
This experiment works more efficiently on a sunny day! Can you guess why...?
Halite (a mineral that has cubic shaped crystals; it is your average table salt!)