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Adding a small amount of chemicals to a hot burning fire can have an 'Ooooh-aaaah' effect. It's important to do these only after all cooking has been done on the fire and when there is little wind so the smoke can rise up rather than into campers' faces.
You may be able to get ahold of these chemicals in a grocery or dry goods store, in the laundry or cleaner section.
Find copper sulfate in swimming pool supplies.
Epsom salts, borax, and calcium chloride may be found with laundry/cleaning supplies.
Copper Chloride, Strontium Chloride, and others my be best found at fireworks supply companies.