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-lastingEosin, the red pigment in lipsticks.Gray=Carbon, Red=Oxygen, Brown=Bromine.
3 Main Processes:1. Foundation2.Coloring Agents3. AdditivesChemistry
-Oil is most commonly used in lip-coloringsince it does not mix with water-Castor oil is the main oil used inlipstick-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 mixthe waxes with isopropyl myristateand other esters-This creates a smooth substancewhen applied to the lips
-Chemists use different dyes to create the right shades oflipstick-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 aminoacids in the lips
-Other dyes are mixed with white aluminum oxide-After this process the dyes are mixed with other solutions thatcreate a precipitate-Equation: Soluble Dye + Precipitate Insoluble Lake-Lake: A water-soluble dye that is combined with othercompounds that are insoluble and colorless→
-The insoluble lake is then mixed with the castor oil. Which areground and mixed together.-After further mixing, the oil and lake mixture forms asuspension. The suspension is then mixed with the otheringredients neededfor lipstick.-The lake method helps the lipstick color to last longer and is amuch stronger, bolder color
Works CitedNova. "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 andPapyrussamming"]. Agyptishes Museum and Papyrussamming:8-11. Print.