Sources:
- WHAT'S THAT STUFF? - Hair Coloring. (n.d.). Retrieved June 11, 2015, from http://pubs.acs.org/cen/whatstuff/stuff/7811scit4.html
- The Chemistry of Permanent Hair Dyes. (2015, May 14). Retrieved June 11, 2015, from http://www.compoundchem.com/2015/05/14/hair-dyes/
- Helmenstine, A. (n.d.). Hair Color Chemistry - How Haircoloring Works. Retrieved June 11, 2015, from http://chemistry.about.com/cs/howthingswork/a/aa101203a.htm
- Evans, L. (2014, December 16). Colour to dye for. Retrieved June 11, 2015, from http://mosaicscience.com/story/hair-dye
- Horne, C. (n.d.). Hair Color. Retrieved June 11, 2015, from http://static.sewanee.edu/chem/Chem&Art/Detail_Pages/ColorProjects_2003/Horne/index.html
- Lansdown, A. (n.d.). Chemistry Explained. Retrieved June 11, 2015, from http://www.chemistryexplained.com/Ge-Hy/Hair-Dyes-and-Hair-Treatments.html
- Brain, M. (n.d.). How Hair Coloring Works. Retrieved June 11, 2015, from http://science.howstuffworks.com/innovation/everyday-innovations/hair-coloring1.htm
- Brown, K., & Hefford, B. (n.d.). Naturally blonde, brunette... Retrieved June 11, 2015, from http://www.rsc.org/chemistryworld/Issues/2003/October/blonde.asp
- Vincent's Hair Design. (2012, October 17). Retrieved June 11, 2015, from http://vincentshairdesign.blogspot.ca/2012/10/why-does-red-hair-color-fade-so-fast.html
- Faces of Chemistry: Hair colourants (Procter & Gamble) - Video 2 (14 ). (2011, October 25). Retrieved June 11, 2015, from https://www.youtube.com/watch?v=eQBbEThc1Po