English to French Science Chemistry; Chem Sci/Eng Chemical reactions for haircolor products

Very important: English to French Canadian

We are talking about haircolor products and how to mix them in order to get new colors.

I am looking for the term "lift" as I feel there might be a more specific chemical meaning to it.

Here is the sentence:

The formulations in these products contain low concentrations of alkali for minimal lift or can be formulated without ammonia for no lift.

Thanks in advance!