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Buy Goldwell Hair Color Semi-Permanent - Goldwell Colorance Demi Color Coloration (Can) 6BK Dark Blonde Brown Copper. 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
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