Before coloring the entire hair, it is recommended to perform a color test on a hidden strand of hair. Choose the lightest strand or the area with the most gray hair. Wear gloves. Mix in a ratio of 1:3 (1 part powder + 3 parts boiling water, green or black tea, coffee, or sour milk product). Apply the color generously and as hot as possible to clean, dry hair using a brush or hands. Start at the tips and work towards the roots. Wrap the hair in plastic film (plastic bag) and towel to keep it warm and moist. Leave the color on for 25-90 minutes, depending on the desired color intensity. Rinse the hair thoroughly and wash with shampoo. For best results, rinse with ZENZ Hair & Scalp Rinse No. 87 after washing and before applying conditioner. Store in a cool, dry, and dark place.