Blonding is one of the most difficult techniques that can be performed on your hair. What makes it complicated is the fact that we are working with a strong chemical that will to some degree damage the hair. So hence the application has to be fast but also precise, meaning that one should work with thin sections and avoid overlapping. Toning is just applying haircolor, usually deposit only, to already lightened hair. It’s the first part, actual application of bleach, that not many people has a chance to master.
So far as of the moment of writing this I have not found any good videos showing how to perform professional bleach application. I found one that is at least close to what I would like to see.
Pros: shows and explains steps of double process blonding.
Cons: does not show any details or close-ups of actual application.