PSI Cosmetology Theory Exam Questions and Answers | Latest Updated 2025/2026 | Graded A+

PSI Cosmetology Theory Exam Questions and Answers | Latest Updated 2025/2026 | Graded A+ Soft Water/ Rain water - answer-Best for shampooing and allows shampoo to lather freely Hard Water - answer-Minerals that lessen the ability of the shampoo to lather Purified water/Deionized water - answer-Main ingredient in shampoo Surfactant - answer-has two ends the HYDROPHILIC HEAD and LIPOPHILIC TAIL Hydrophilic Head - answer-Attracted to water Lipophilic Tail - answer-Attracted to dirts and oils Acid Balanced Shampoo - answer-pH of 4.5-5.5 Jheri Redding - answer-first to introduce pH balanced shampoo in the 1960s Clarifying Shampoo - answer-acidic base to cut through buildup on the hair strand Humectants - answer-Most conditioners carry this. Promote retention of moisture Instant conditioners - answer-remain on the hair 1-5 minutesProtein Conditoners - answer-brown liquids and penetrate into the cortex to temporarily improve porosity and increase elasticity Infraed Lamps - answer-may be used with hair treatments and scalp tonics for 5 minutes High Frequency Unit - answer-used to normalize oily scalp conditioners! Also never should be used with tonics that contain alcohol Base Control - answer-position of the rod in relation to its base section croquignole perm wrap - answer-wrapped perpendicular to the scalp starting with the ends Spiral Perm Wrap - answer-Wound from the ends to scalp and rods hang vertical