The powder is called "Mica Powder" it's found in the "stamping" section of craft stores. Very small container so it must be expensive. I believe my wife said it came in a set. The brand name is Jacquard Products...the color I used was "Flamingo Pink". It does tint the plastic some, I discovered after using a blue powder. I don't think it has the same effect as the stuff used by others for plastics in creating the metallic/pearl effect....but for me it's not a negative thing..With that being said, if you have to buy a powder, I would buy the real thing....hope that helps.
Rick