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Chemistry in Hairdressing

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shay ford

on 28 January 2014

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Transcript of Chemistry in Hairdressing

Chemistry in Hairdressing: Hair Dye
Hair Dyes:
More on Permanent Dyes:
Hair Dye:

Permanent Hair Dyes:
Everything About It:
More on Dyes:
Permanent dyes can last forever, except sometimes the colour of the hair can fade. The colour dye of red is the most common colour that will fade in peoples hair overtime.
Permanent Dye
Does it cause cancer?
Different types
Temporary Hair Dyes:
This type of dye stays in your hair for about 1-2 washes.
This dye covers the surface of your hair but does not enter into the hair shaft.
No chemical reaction occurs because peroxide is not present.
Semi- Permanent Hair Dyes:
This type of dye stays in your hair for about 5-10 washes.
This dye covers the surface of your hair and does enter into the hair shaft.
No chemical reaction occurs because peroxide is not present.
Permanent Hair Dyes:
This type of dye stays in your hair until your hair grows it out.
This dye covers the surface of your hair and enters into the hair shaft.
This dye makes lasting chemical changes in the hair shaft.
Another word that people call this dye is "coal-tar dye". They call it this name because some of the ingredients that are in the dye.
Some of the ingredients that are in permanent dyes are colourless substances such as; aromatic amines and phenols.
The substances, aromatic, amines and phenols go into a chemical reaction if hydrogen peroxide is involved. If it is, then it will become a dye after the chemical reaction is finished.
Ammonia will open the cuticle to allow the colour to enter
To detect cancer, scientist would use animals and test the dyes on them. In 1970, they detected cancer from one of the chemicals named; aromatic amines. Since they detected this, hair dye manufacturers changed some of the chemical ingredients in their products.
This might not be accurate because scientist would give the animals large amounts of dye over a long period of time which could be a different effect on a human, because they wouldn't need large amounts of it.
Permanent oxidation dye came from the conclusion that this colourless "p-phenylenediamine" makes a coloured compound when it is reacted with oxidation. This reaction would make many colour variates. Hydrogen peroxide is the chemical that makes different colours for the dyes.

The first successful permanent dye was created by a chemist named Eugene Schueller in 1907. The main ingredient that was used in his dye is paraphenylenediamine. This ingredient is still used in today's dyes.
Some products that are combined to make permanent dye are bleach and colouring agent. The bleaching product helps the hair for colouring by expanding and opening the hair cuticles. When the dyes react with the hair a chemical reaction occurs which is how it stays permanent in the hair.
Oxidation Diagram
Oxidation dyes belong to three major chemical families:
Aminophenols (amino naphthols)
Phenols or naphthols

Oxidation dyes are usually colourless and a low molecule weight product. Oxidation dyes fall under two categories: oxidation base (primary intermediate) and coupler (secondary intermediate). To have colour using these types, you should use one type of each and mix it with oxidant under alkaline circumstances.
Semi- permanent dye contains large and small colour molecules that keep to the outside of the hair.
The Chemistry of Hair Dye. (n.d.). The Chemistry of Hair Dye. Retrieved from http://www.chem.shef.ac.uk/chm131-2003/cha02js/dye.html

Helmenstine, A. M. (2014). How Shampoo Works. About.com Chemistry. Retrieved from http://chemistry.about.com/od/howcleanerswork/a/How-Shampoo-Works.htm

The Organic Solution. (n.d.). The Organic Solution. Retrieved January 05, 2014, from http://theorganicsolution.wordpress.com/2012/05/21/hello-world/

Oxidation Dyes. (n.d.). Oxidation Dyes,Oxidation Hair Dyes,Oxidation Dyes Exporters,Oxidation Dyes Suppliers. Retrieved from http://dyes-pigments.standardcon.com/oxidation-dyes.html

"Hair Dyes." Hair Dyes. N.p., 17 Feb. 2011. Web. <http://www.cancer.org/cancer/cancercauses/othercarcinogens/intheworkplace/hair-dyes>.

This is ammonia
This is paraphenylenediamine
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