Olga_RivasLog

Article summary []
 * Hair dyes can be classified into 3 categories: permanent, semi-permanent, and temporary hair colors. Permanent hair color, the most popular today, can be further divided into oxidation and progressive hair dyes.
 * Oxidation hair dyes contain a solution dye of intermediates (commonly PPD), preformed dyes (such as PPD derivatives), and a solution of hydrogen peroxide.
 * The hydrogen peroxide solution, also known as the developer, is combined with the ammoniacal dye solution just before application to the hair.
 * Upon application, the hair will swell and the dye intermediates will penetrate the hair shaft before they react with each other and the hydrogen peroxide to form the hair dye.
 * The active ingredient in progressive hair dye is lead acetate in a concentration less than 0.6% w/v. These work by changing hair color to black by reacting with the sulfur in the hair keratin.
 * Semi permanent and temporary hair color are made of various coal-tars, synthetic organic dyes that adhere to the hair shaft to a lesser extent. Simply shampooing the hair can remove these dyes.
 * Coal-tar dyes have been known to cause cancer. A label warning reading "Warning - Contains an ingrediant that can penetrate your skin and has been determined to cause canter in laboratory animals" is required on those products contain the cancer causing chemical 4-MMPD.

Outline I) Intro II) History of hair dye III) Structure of hair IV) Types of dyes and compositions V) How the dyes works VI) Health risks VII) Natural alternatives and how they work VIII) Other applications IX) Conclusion

[1] Turk, R. 1995, Jan 12. // A brief history of hair : Dyeing. bleaching. coating with lard! what some women through the years have done--and will do--for a 'do //. [|Link] [2] // Eugene schueller: Founder of l’oreal //. 2013, Feb 18. [|Link] [3] Kenneally, D. // Hair color reseach update //. [|Link] [4] // Keratine: superb chemistry //. [|Link] [5] S ustaita, H. // Chemical composition of hair //. [|Link]

[6] Oliver, D. 05, Nov 2013. // A brief guide to hair dye: Semi-permanent vs. permanent vs. bleach //. [|Link] [7] // Hair dye products //. 1997, Nov 01. [|Link] [8] Forbes, N., Galley, E., & Sheard, C. 2010, March 30. // Oxidative hair dyes and related topical compositions //. [|Link] [9] Brown, K. 2000, June 08. //Hair coloring//. [|Link] [10] // Exposure to reactants and reaction products of oxidative hair dye formulations //. 2005, Dec 13. [|Link] [11] S H Zahm , D D Weisenburger , P A Babbitt , R C Saal , J B Vaught , and A Blair . Use of hair coloring products and the risk of lymphoma, multiple myeloma, and chronic lymphocytic leukemia. American Journal of Public Health July 1992: Vol. 82, No. 7, pp. 990-997.

[|Link] [12] Nation Cancer Institute. (2011, Aug 10). // Hair dyes and cancer risk //. [|Link]   [13] Sherman, C. 2008, Feb 08. //T// // he dangers in hair coloring and safer alternatives. [|Link] //  [14] Henna. In //Wikipedia////. [|Link] // [15] <span style="background-color: #ffffff; font-family: 'Times New Roman'; font-size: 16px; line-height: 1.5;">Cthuliz. 2012, March 04. [Web log message]. [|Link] <span style="background-color: #ffffff; font-family: 'Times New Roman'; font-size: 16px; line-height: 1.5;">[16] Danielle. 2012, Sept 19. // Dye your hair pretty much any color with specially brewed diy tea //. [|Link] [17] DuPont. // p-phenylenediamine (ppd) //. [|Link] [18] <span style="background-color: #ffffff; font-family: 'Times New Roman'; font-size: 16px; line-height: 1.5;">Lecher, H. (1955). The chemistry of synthetic dyes and pigment. [|Link] <span style="background-color: #ffffff; font-family: 'Times New Roman'; font-size: 16px; line-height: 1.5;">[19] //History of haircolor. [|Link]// [20] Hair. In //Wikipedia.// [|Link]

References I) Intro II) [] [] [] III) [] [] IV) [] [] [] V) See dyemech.doc [] repeat!

VI) [] [] [] VII) [] [] [] repeat! [|http://www.xovain.com/hair/teas-for-your-hair#awesm=~ooSO52eoxuG8GR]

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