For generations, bluing has been known as an essential ingredient of a "Salt Crystal Garden". This delightful crystalline formation became popular in the Great Depression, and is still known to some as a "Depression Flower" or "Coal Garden". By combining common ingredients (salt, water, bluing, food coloring and ammonia) over a porous base material (Coal, sponge, or other), the salt recrystallizes into beautiful, delicate coral-like formations. Children growing one of their own have been winning blue ribbons in science fairs ever since! Elementary teachers find it invaluable in teaching their students about crystals - learn about more ideas for teachers.
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