review

Question 1

what are the 2 steps of a perm

Answer 1

physical change- wrapping the hair on the perm rod

chemical change- the application of permanent wave solution and neutralization

Question 2

should an elasticity test be done on dry or wet hair?

Answer 2

strand must be wet

Question 3

how to determine good and bad elasticity

Answer 3

good elasticity -if the hair returns to its original length when released

bad elasticity- the hair breaks or doesn’t return to its former length

Question 4

disulfide bonds

Answer 4

are broken down with perm solution and rebuilt with neutralizer

Question 5

Once the ______ bond is broken, the ______ can form into their newly formed shape. ______ breaks disulfide bonds and ______ reforms them.

Answer 5

dulfide
polypeptide
reduction
oxidation

Question 6

what do all permanent wave solutions contain?

Answer 6

they all contain a reducing agent, commonly referred to as THIO

Question 7

what is thioglycolic acid

Answer 7

a colourless liquid with a strong, unpleasant smell. it is the most common reducing agent used in permanent waving solutions.

Question 8

what determines the strength of the solution

Answer 8

the concentration of THIO, stronger perms have a higher concentration

Question 9

what does higher THIO concentrated solutions do?

Answer 9

breaks down more disulfide bonds