The Goldwell System Thickener is a concentrated fluid designed to customize and thicken the consistency of hair color and lightener mixtures. It prevents the product from running or bleeding, making it ideal for precision freehand techniques like balayage without affecting processing time or color results. Viscosity Control: Prevents color and bleach from spreading or bleeding, allowing high-contrast shades to sit side-by-side without foils. No Performance Impact: Does not alter tone accuracy, color intensity, or processing time. Compatibility: Works seamlessly with professional lines like Goldwell Topchic, Colorance, Nectaya, SilkLift, and Oxycur. HOW TO USE Shake the bottle well before use. Prepare and mix your preferred Goldwell hair color or lightener formula as usual. Start by adding 10 drops of the thickening fluid into the mixture. Stir thoroughly until you reach your desired consistency, then apply immediately.