Questions
- What is hair made of?
- What color hair is eumelanin responsible for?
- How is keratin removed from the hair?
- What are the two methods for dyeing hair with temporary/semi-permanent hair dye?
- What is the effect of ammonia not being a component of temporary/semi-permanent dye?
- What are the properties of Aminoanthraquinone?
- What happens during the bleaching process to the keratin? What effect does that have?
- Why is ammonia often a component of permanent hair dye?
- What are the three coupler colors?
- What is one of the main chemicals used in permanent hair dye?
Answer Key
- Keratin, water, and sometimes blood.
- It is responsible for brown or black hair.
- Keratin is removed from hair when it the hair is damaged chemically, physically, or from the environment (sun depletes keratin).
- The dye is either made of acidic dyes that are put on the outside of the hair shaft and make their way in, or it is made out of very small pigment molecules that go inside the hair shaft, sometimes using a small amount of peroxide (bleach).
- The hair shaft isn't opened up during processing. This means natural color isn't removed, and it is retained once the dye is removed.
- It is a red or orange-brown solid that is needle shaped that is insoluble in water but soluble in acetone, alcohol, chloroform, and benzene.
- The keratin is oxidized, meaning it becomes colorless.
- Ammonia causes the cuticles of the hair shaft to swell, which makes it easier for the permanent dye to be let in.
- Blue, red, and green.
- Paraphenylenediamine.