Oxygen 40 volumes with ammonia
It is used to go to very distant tones from the starting ones, for example from a brown to a platinum blonde. In this case, you need to reduce the color by six tones, therefore it will be necessary to adopt greater volumes.
With this last type of volume, you need to be careful, because the lightening power is very strong. You may run the risk of having orange hair, with a pigment tending towards straw yellow.