ch 20 Flashcards
(29 cards)
For _____ placement, the hair is wrapped at a 45-degree angle beyond perpendicular to its base section,
and the rod is positioned on its base.
on base
A ____ is a thio-based chemical service that reformats curly and wavy hair into looser and larger curls and waves.
soft curl permanent
Hydroxide relaxers remove one atom of sulfur from a disulfide bond, converting it into a ____ bond.
lanthionine
When performing a perm, you should always:
smell the hair after the recommended time has elapsed
Which of these is NOT a component of all exothermic waves?
hydroxide relaxer
A pH of ____ is neutral for hair.
5
Thio neutralization rebuilds disulfide bonds by:
removing hydrogen
A preliminary test curl will NOT answer which of these questions?
Is the client allergic to any of the products that will be used?
Underprocessed hair is usually:
straighter at the scalp and curlier at the ends
When the silicone polymers and formalin in keratin-based straightening treatments are heated to high temperatures, they release:
formaldehyde gas
The strongest of the three side bonds are:
disulfide bonds
Which type of perm should you recommend if the client has very damaged hair?
true acid wave
The basic permanent wrap is also known as a:
straight set wrap
Polypeptide chains are long chains of amino acids joined together by ____ bonds.
peptide
Thio relaxers use the same ATG that is used in permanent waving, but at a:
higher concentration and a higher pH
How long is a typical soft bender rod?
12 inches
A pH of ____ is neutral for hair.
5
The neutralizer used with thio relaxers is usually:
hydrogen peroxide
An acid-balanced wave has a pH of:
7.0
What two important functions are performed by the neutralization process?
deactivating waving solution and rebuilding disulfide bonds
Peptide bonds are also known as:
end bonds
What is the primary benefit of ammonia-free waves?
They do not have a strong odor.
Which type of wave is activated by an outside heat source, such as a conventional hood-type hair dryer?
endothermic
Base placement is determined by the:
angle at which the hair is wrapped
