Hair ServicesQuestion 350 of 484
What is the primary difference between a single-process and a double-process hair color service?
a.Single-process uses semipermanent dye; double-process uses temporary dye
b.Single-process is performed by barbers; double-process is performed only by cosmetologists
c.Single-process requires a patch test; double-process does not
d.Single-process lifts and deposits in one step; double-process pre-lightens first, then deposits tone in a second step
Explanation
A single-process color combines lift and deposit in one application. A double-process requires first pre-lightening (bleaching) the hair to remove pigment and then applying a separate toner or color in a second step. Double-process is used for dramatic light blondes or fashion shades.
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