Cosmetology Theory - pH

pH - Potential Hydrogen

pH Function/Does

Measures acidity and alkalinity of a substance

• pH represents the quantity of hydrogen ions

• Range from 0-14

• 7 is neutral

• 0 to 6.9 is acid

• 7.1 to 14 is alkaline

• Logarithm means multiple of 10

• pH of the hair and skin is 4.5 to 5.5

Alkaline on Hair - expands it, opens up cuticles.

Put neutralizer on after these services to close the cuticle up again.

Farther you move from 7 (neutral). Stronger/more acidic the product will get.

Fruits and Fruit Juices High in Acid

• lemon juice (pH: 2.00-2.60)

• limes (pH: 2.00-2.80)

• blue plums (pH : 2.80-3.40)

• grapes (pH: 2.90-3.82)

• pomegranates (pH : 2.93-3.20)

• grapefruits (pH: 3.00-3.75)

• blueberries (pH : 3.12-3.33) (pH Testing Strip)

• pineapples (pH: 3.20-4.00)

Alkaline Cleaning Products & Their pH

• washing-up liquid (pH 8)

• baking soda (pH 8)

• hand wash (pH 9)

• laundry detergent (pH 10)

• all-purpose cleaner (pH 11)

• oven cleaners (pH 13)

• bleach (pH 13)
  

In Class Tests

• Relaxer (pH 12)

• Cholesterol Conditioner (pH 4)

• Acetone (pH 7)

• Hair Color Developer - (pH 4?)

• Freeze and Shine Hairspray (pH 5??)

• Bath and Bodyworks Body Lotion (pH 4)

• Victoria Secret Body Spray (pH 4)