Hydrogen bonds are weak physical side bonds that result from an attraction between negative and positive electrical charges and are easily broken by water or heat, but reform as the hair is ___.
dried
What determines the size of the curl in a permanent waving process?
the size of the rod
All acid waves have three components: permanent waving lotion, neutralizer, and ___.
activator
The ___ of the permanent waving solution is determined primarily by the concentration of the reducing agent, or thio.
strength
In permanent waving, the shape and type of curl are determined by the shape and type of rod and the ___.
wrapping method
What are the most common reducing agents used in permanent waving?
thioglycolic acids
Waves that are activated from an outside heat source, such as a conventional hood-type hair dryer, are ___ waves.
endothermic
Most acid waves used in salons have a pH value between ___.
7.8 and 8.2
What is the second factor in the overall strength of the waving solution?
degree of alkalinity
Modern acid waves are actually ___ waves, whcih are permanent waves that have a 7.0 or neutral pH.
acid-balanced
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