The Wella Blondor Freelights Developer 20 Vol. (6%) is a key part of the Blondor Freelights system, designed for natural-looking, foil-free highlights. Its Actifuse Technology blends with Blondor Freelights White Lightener to create a flexible mix for precise, freehand application. This developer offers controlled, gentle lift, perfect for subtle yet effective lightening, ensuring reliable, blended results.