Buy Goldwell Hair Color Permanent - Goldwell Topchic Hair Color Coloration (Can) VVMix Violet-Mix. How-to-Use: Recommendation: Perform a preliminary patch test according to the following directions prior to each application, even if the client has had color treatments before. Using a cotton-tipped applicator, apply the color mixture to a 1' x 1' patch of clean skin (gently wash with mild soap and water) on the inside of the forearm and leave to process. After 45 minutes, cleanse the area thor
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