These are instructions for making colored fire in all the colors of the rainbow. I also have a video
of a colored fire rainbow, so you can see the effect of using multiple colorants.
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Blue fire can be produced by burning a fuel which produces a blue flame or by heating a chemical that produces blue fire, such as copper chloride.
Green fire is one of the easiest colors of fire to produce. Both written
instructions are available.
Søren Wedel Nielsen
Yellow fire is a natural color for most fires, but it's very simple to change the color of a blue or colorless flame to yellow.
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You can create orange fire using a chemical you likely already have at home.
Red fire is produced by strontium salts, which can be found in road flares, among other places. This fire color is very bright.
Purple fire is easy to make using non-toxic potassium compounds. Violet or purple is a flame color that is easily overpowered by other colors, so if you want a purple fire it is best to use a blue-burning fuel for your fire, such as an alcohol.