Oxygen 20 volumes with ammonia
If you need a less dark color and total coverage of gray hair, then it is best to adopt oxygen in 20 volumes. It is used for all types of hair, has excellent coverage and is the most used both at home and in beauty salons.
Even though it is smaller, it still has a lightening function, which allows you to obtain a slightly lighter color than the 10 volume. However, if you need to reduce two, four or seven tones, then you need to switch to oxygen in 30 or 40 volumes.
