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The Cooling Violet Additive can be added to any existing Wella Color Charm shade to reduce unwanted warm tones. This is ideal if your clients hair has a high degree of natural warm tone (underlying pigment), or if you want to create a more matte type of result. Tip: When working with darker shade selections,use more Cooling Violet Additive to achieve more noticeable results. Lighter-shade selections will normally require less Cooling Violet Additive to achieve your desired result.