The element Boron is used in pyrotechnics and flares, it is used to create a green color. Boron is strong enough to use as a radiation shield in nuclear reactors. Boron has commercial compounds: one is sodium borate, or borax, which is used in laundry detergent. It is also a key ingredient in ooblek (see my post about flubbericious gak).
At first, I wanted to make green fireworks on a white background and then paint the card with a solution of borax and water to make borax crystals on the surface. But the Borax did not stick on the paper , so I made the same design on black paper with a silver sharpie and metallic colored pencils.
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