chapter 20 chemical texture services

Which layer of the hair contains the disulfide bonds changed during permanent waving?

cortex

What is the main purpose of a permanent wave neutralizer?

reform disulfide bonds to stabilize the new shape

Which chemical is commonly used in traditional thio permanent waving solutions?

ammonium thioglycolate

Compared with a true acid wave, an alkaline permanent wave generally has:

a higher ph and more hair swelling

Why is hair wrapped around perm rods?

to determine the curl size and shape

What is the purpose of a preliminary test curl?

to check curl development and processing

What does a strand test help determine?

how the hair responds to a chemical service

Which is an important safety practice before a chemical texture service?

preform a consultation and hair analysis

How do thio relaxers straighten hair?

by reducing disulfide bonds

What chemical process is associated with hydroxide relaxers?

lanthionization

Which hair structure provides much of the hair's strength and elasticity?

cortex

What should a stylist do if a client's scalp has irritated or broken skin before a relaxer service?

postpone the service until it is safe

During a relaxer retouch, where should the product generally be applied?

only the new growth, avoiding overlap

What is the main function of the cuticle?

protect the inner layers of the hair

Which factor most directly affects the size of a permanent wave curl?

the size of the perm rod

Why must a stylist follow the manufacturer's processing instructions?

to use the product according to its safely and performance directions

What can happen if hydroxide relaxer overlaps onto previously relaxed hair?

excessive processing and breakage can occur

What is the purpose of wearing appropriate gloves during chemical services?

to protect the hands from chemical exposure

What should be considered when choosing a chemical texture service?

hair condition and previous chemical services

What is the primary goal of a permanent waving service?

reshape the hair into a curl or wave pattern