Hair Dye Chemistry and Effects

The video explores the chemistry behind artificial hair color, tracing its history from ancient times to modern chemistry. It explains hair anatomy, focusing on the cuticle and cortex, and how dyes penetrate these layers. The video details the chemical reactions involved in permanent hair coloring, including the roles of hydrogen peroxide and ammonia. It also discusses how dye molecules and couplers adjust color tones. Finally, it addresses potential hair damage from dyeing and offers maintenance tips, such as using antioxidants to protect color.

Who was the French chemist responsible for marketing the first artificial hair color formulation?

• Louis Pasteur

• Antoine Lavoisier

• Marie Curie

• Eugène Schueller

What is the visible part of the hair that you can style called?

• Hair bulb

• Hair follicle

• Hair shaft

• Hair root

Which chemical is commonly used as a developer in hair dye solutions?

• Sodium hydroxide

• Hydrogen peroxide

• Ethanolamine

• Ammonia

What is the role of ammonia in the hair dyeing process?

• To moisturize the hair

• To act as a colorant

• To swell the hair shaft

• To add fragrance

What happens to the hair cuticle after the ammonia is washed out?

• It dissolves completely

• It falls back in place

• It becomes more flexible

• It changes color

What alternative to ammonia might help reduce hair damage?

• Ethanolamine

• Sodium chloride

• Magnesium sulfate

• Calcium carbonate

What can degrade the new pigment in dyed hair?

• Low pH levels

• High protein content

• Excessive moisture

• Free radical oxygens

Why should blondes avoid copper in swimming pools?

• It can make hair oily

• It can cause hair loss

• It can create a green tint

• It can make hair brittle

What do some color-protecting shampoos contain to maintain hair shine?

• Proteins

• Minerals

• Antioxidants

• Vitamins

What environmental factor can affect dyed hair color?

• Temperature

• Humidity

• Wind

• UV rays