how long to process redken color gels
The processing time for Redken Color Gels varies by developer volumes, levels of lift, and hair texture, porosity and gray coverage. The following are some general guidelines:â¦ 10V, lifting 1 level: process 20 mins. 20V, lifting 2 levels: process 30 mins. 30V, lifting 3 levels: process 40 mins.