Comb Color Usage: Use Dry Hair Directly, Gently Press the Comb Pressing Utensil, the Existing Paste Flows from the Middle of the Comb, and Comb Evenly with the Comb Repeatedly, let the Paste Stick to the Root of Each Hair and Comb It Evenly. Then, Take a Shower Cap and Stay for about 40-60 Minutes. (According to the Hair Quality, Everyone) Observe the Color of the Hair. after the Color Is Satisfactory, Rinse It with Warm Water. If the Temperature Is Low, It Is Better to Use a Hair Dryer to Heat the Dyed Hair for 20 Minutes. (Comb Black Natural Black: It Only Takes 25-30 Minutes to Color)