Ch. 20 Chemical Textur Services

Most common type of perm rod.

• Concave Perm Rod
• Loop Rod
• Spiral Perm Wrap
• Croquinole Wrap

Also known as the circle rod.

• Loop Rod
• Basic Perm Wrap
• Convex Perm Rod
• Piggy Back Wrap

Tough Exterior Layer of the Hair.

• Cuticle
• Medulla
• Cortex
• Sales of Hair

Permanent wave that have a 7.0 or neutral PH.

• Acid Balanced Waves
• Thio Waves
• Exothermic Waves
• Endothermic Waves

Hair is wrapped at an angle other than perpendicular to the length of the rod.

• Spiral Perm Wrap 
• Croquinole Wrap
• Brick Layer Wrap
• Piggy Back Wrap

Term Ph is the abbreviation for Potential Hydrogen.

• True
• False

Salt bonds can be broken by water, where as disulfide bonds are broken with changes in PH.

• True
• False

The single flat wrap uses one end paper folded over in half over the hair ends like an envelope.

• True 
• False

ON-base placement minimizes stress and tension on the hair.

• True
• False

The strength of any permanent wave solution is based on its concentration of it's reducing agent.

• True
• False