Such as blue, green purple etc flames.
Use different metal salts.Magnesium makes white. (epsom salts)Copper makes blue I think.Sodium makes yellow. (table salt)etcetc.
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Typically you put different chemicals into the fire to make different colors. There is a good chart on this site that lists the chemicals to use to get different colors.http://chemistry.about.com/cs/howtos/a/aa052703a.htm