chemistry of lipstick (1)
TRANSCRIPT
LipstickKatie Monsor
Summary
-Lipstick has been used since the timeof the Egyptians
-Over the centuries chemists have beenimproving the formula for lipstick
-Requirements chemists must meet:melting, sweating, long-lasting
Eosin, the red pigment in lipsticks.Gray=Carbon, Red=Oxygen, Brown=Bromine.
3 Main Processes:
1. Foundation
2.Coloring Agents
3. Additives
Chemistry
-Oil is most commonly used in lip-coloring since it does not mix with water
-Castor oil is the main oil used in lipstick
-Castor oil is thick and will helpthe lipstick to last longer
-Chemists use Carnauba wax in lipstick so that it will not melt
-Carnauba wax has a melting point of 85 degrees Celsius
-Waxes can be sticky so chemists mix the waxes with isopropyl myristateand other esters
-This creates a smooth substance when applied to the lips
-Chemists use different dyes to create the right shades of lipstick
-Dyes can be soluble in water. This causes problems with salivaand the oils.
-Chemists must create dyes that are insoluble in water and oil
-Most dyes are combined with metal oxides
-These dyes are colorless until they are mixed with the amino acids in the lips
-Other dyes are mixed with white aluminum oxide
-After this process the dyes are mixed with other solutions that create a precipitate
-Equation: Soluble Dye + Precipitate Insoluble Lake
-Lake: A water-soluble dye that is combined with other compounds that are insoluble and colorless
→
-The insoluble lake is then mixed with the castor oil. Which are ground and mixed together.
-After further mixing, the oil and lake mixture forms a suspension. The suspension is then mixed with the other ingredients needed
for lipstick.
-The lake method helps the lipstick color to last longer and is amuch stronger, bolder color
Works Cited Nova. "Putting on a Good Face." Australian Academy of Science.
Nova, n.d. Web. 2010. <http://www.science.org.au/nova/083/083key.html>.
Senese, Fred. "What is the chemical composition of lipstick?" Chemistry of Everyday Life: n. pag. General Chemistry Online. Web. 2010.<http://antoine.frostburg.
edu/chem/senese/101/consumer/faq/lipst ick-composition.shtml>.
Sibley, Lynn. "Lipstick" ["Agyptishes Museum and Papyrussamming"]. Agyptishes Museum and Papyrussamming: 8-11. Print.