Mix the first agent and second agent at a 1:1 ratio. Leave on for 30 minutes. Suggested amount of the first agent: 40–50g for short hair, 50–60g for medium hair, and 70g or more for long hair.
Select the second agent according to hair type: 6% for coarse or oily hair that is difficult to color, through standard hair; 3.7% for soft or dry hair that is easier to color. If the new growth is longer than 3cm, applying in two stages is recommended.