A client asks for a 'double-process' blonde service. Compared with a single-process color, a double process means:
Explanation
A SINGLE-process color completes lift (if any) and deposit in a single application of one formula. A DOUBLE-process service uses two distinct chemical steps in sequence: a pre-lightener (typically powder bleach plus developer) lifts the natural pigment to the required underlying level, then a separate toner or oxidative color is applied to deposit the chosen cool, neutral, or warm tone. This is the standard route to pale-cool blonde from a darker natural starting point. California licensees perform both processes under CCR Title 16 §979.4. Option A confuses re-application with double process. Options C and D invent rules with no statutory basis.
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