Chemistry & ProductsQuestion 302 of 484
A bleach manufacturer specifies a 1:2 ratio of lightener powder to developer. If you scoop 1 ounce of powder, how many ounces of developer do you add?
a.0.5 ounce
b.2 ounces
c.3 ounces
d.4 ounces
Explanation
A 1:2 powder-to-developer ratio means two parts developer per one part powder. 1 oz powder x 2 = 2 oz developer. Using less developer than directed produces a stiff, dry paste that overheats and can scorch hair.
Practice all 484 questions free — no signup required.
Related questions on this topic
- After a chemical service that raises the hair's pH (such as relaxing or permanent color), an acidic 'normalizing' or finishing rinse is used to:
- A solution at pH 3 contains how many more hydrogen ions than a solution at pH 6?
- When an alkaline product such as ammonia is applied to the hair, the cuticle layer:
- Approximately what percentage of hydrogen peroxide by weight is in a 40-volume developer?
- Compared with a thiol-based (ammonium thioglycolate) perm, a sulfite-based 'true acid' perm typically:
- Surfactants in shampoo are classified by the electrical charge of their head group. Which charge class is the primary CLEANSING surfactant in most shampoos?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California Board of Barbering & Cosmetology Exam · How we review