Wella Color Charm Crème Developer 20Vol. (3.7 oz)

Volume: 20 Volume (6% hydrogen peroxide).
Purpose: Standard lifting, grey coverage, and, when needed, lightening.
Mixing Ratio: Typically 1 part color to 2 parts developer (1:2).
Processing Time: 30–45 minutes.
Texture: Creamy, designed for bowl and brush or bottle application.
Safety: For professional use; requires skin sensitivity test

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