For Candles: add the chemicals to the wax, or soak the wicks in a solution of the chemicals using the following recipe.
To Add to a Fire: Put three level spoons of the chemical into a paper cup; fill 1/2 full with water and stir. Soak several small chips of wood in this solution overnight. The next day, remove the chips with tweezers and lay on newspaper to dry. They can now be added to the flames to produce bright colors.
Green flame: Borax or Boric acid, copper nitrates or barium nitrates
Orange flame: calcium chloride
Red flame: stronium nitrate
Yellow flame: Sodium Chorate or Potassium Nitrate
Purple flame: Lithium Chlorate
Found on WebSite Magic Fun