I am not sure if you are referring to any specific tecnique but one way to acieve this is to roll a black base bead in small silver and gold chunks. First roll in 22 or 24 ct gold clippings and heat in an oxidizing flame until the metal starts to burn and leaves a trace deposit of gold fume on the surface. Next roll in .999% pure siler clippings and gently heat in a reducing flame until the metal smokes and leaves a fume deposit. Then encase with clear the fumed bead with imbedded metal chunks taking care not to burn off the fume. The finished bead should look like it has small metal comets with blue green or pink tail when done properly.
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