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Skin Care All about skin care! |
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04-06-2002, 11:03 AM | #3 (permalink) |
Join Date: Oct 8 2001
Posts: 150
Rep Power: 23 | DHA or Dihydroxyacetone is the most commonly used self-tanner, it was discovered by who else but the Germans, in the 1920’s. DHA is similar in chemical synthesis to a stain that was used to develop X-ray films, and much like many great discoveries it was developed by mistake. It was not until 1960 that DHA was really discussed as a possible tanning additive for skin. Some time in the 60’s, Coppertone developed the first cosmetic self-tanner. DHA is a complex carbohydrate or better known (in loose terms a form of a sugar) it reacts with the skins amino acids, peptides and amines in only the outmost layer of skin, the horny layers. Ever wonder why DHA tans the hands and elbows better than anyplace else on the body, especially better than the face….(the easy answer, and answer most often given is they are dry and the moisture absorbs quicker…Well almost true and it may contribute, however. …Actually it is because the hands and elbows, thanks to evolution for protection purposes are significantly thicker with a much more robust horny layer or Stratum Corneum.) The reaction with DHA and the amines on your skin first forms pyruvic aldehyde which then through some long chemical sequence that involves keto and aldo reduction…yada yada yada… Already getting boring…..It results in aliphatic linear polymers that many refer to as “melanoidins”. DHA is fairly reactive and formulating is the key to how well it works or if it is even stable. DHA reacts with amines and acrylates or methacrylates in lotions…Little hint if your bronzer lotion has Triethanolamine or Carbomer listed on the label, chances are you are buying the ingredient name or the “bronzer” concept and the marketing that went with it, because DHA in formulations with these ingredients will react and breakdown the DHA…. If you have any specific questions please feel free to email me or call me directly. Eric |
04-06-2002, 08:36 PM | #5 (permalink) |
Join Date: Jan 17 2002
Posts: 4,339
Rep Power: 24 | Actualy Cleopatra used henna as a self tanner..to add color to herself when she went to seduce Mark Anthoney 2400 years ago. But women are always ahead of the time.. Triethanolamine is used as a PH adjuster.. at least that is what I remember..also it's used sometimes as an ingeredient to add fragrance. |
08-03-2005, 09:46 AM | #7 (permalink) |
Join Date: Nov 30 2000 Location: Ontario Age: 61
Posts: 38,594
Rep Power: 107 | DHA was discovered as a skin-coloring agent in the 1920s and appeared commercially in the 1960s. Coppertone was the first to sell an over-the-counter product, Quick Tan, and unfortunately QT's streaks, splotches and orange skin tints quickly encapsulated everything viewed as negative about sunless tanning. The Academic Press Dictionary of Science and Technology defines dihydroxyacetone like so: "CH2HOCOCH2OH, a colorless, hygroscopic, crystalline powder; soluble in water and alcohol; melts at 80oC; used as an intermediate and in fungicides and cosmetics." The tanning industry recognizes dihydroxyacetone, or DHA, as the colorless sugar that makes the magic happen in the self-tanning process. DHA reacts with skin proteins, including amino acids, in the outermost layer of skin. The reaction develops brown skin coloring that looks very similar to a natural tan. Skin coloration takes anywhere from two to four hours and lasts three to five days--depending on skin type and the DHA concentration in the lotion. The "tan" fades as the dead layers of skin slough off, just as in normal tanning. |
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