By John Toedt; Darrell Koza; Kathleen Van Cleef-Toedt
Not only tables of arcane symbols and numbers, yet essays for common readers clarify the parts and their motion in such items as soaps and laundry, cosmetics and toilet, future health and clinical, child, cleansing, lighting fixtures, universal loved ones and garden, car and normal fix, and place of work offers. Toedt (physical sciences), Darrell Koza (chemistry, either, jap Connecticut nation U.) and Kathleen van Cleef-Toedt (physiology and neurobiology, U. of Connecticut) additionally conceal such universal fabrics as paper, plastic, cement, and spray paint. The appendix units out protocols for laboratory workouts.
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Extra resources for Chemical Composition of Everyday Products
Silicones commonly used include dimethicones, dimethicone copolyols, cyclomethicones, phenyl trimethicone, amodimethicones, and trimethylsilylamodimethicones. Proteins and their hydrolysates are another class of conditioning agents; these include materials derived from animals and vegetables, such as keratin, collagen, elastin, silk, soy, corn, and wheat. , oleic acid, stearic acid, linoleic acid, lauryl alcohol, cetyl alcohol, stearyl alcohol, glycol stearate, polysorbate 20, beeswax, lanolin, glycerin, mineral oil, almond oil, and avocado oil).
HAIR COLORING Available in a variety of colors and shades, hair-coloring vegetable extracts and powdered metals have been used since the earliest record of human history as cosmetic agents. While Greek women were known to dye their hair black, Queen Elizabeth I dyed her hair red. Henna, a vegetable dye with an active component called lawsone (2-hydroxy-1,4-naphthoquinone), has been used throughout the centuries to give hair a red-orange tint. In addition, weak solutions of hydrogen peroxide were and currently are used as hair bleaches.
Generally, conditioner ingredients include water, primary conditioning agents (quaternary ammonium salts, cationic polymers, silicones), refatting agents (fatty alcohols, waxes), secondary conditioning agents (natural oils, silicones), emulsiﬁer (typically nonionic surfactants), specialty additives (proteins, resins, dyes), thickeners, pH adjusters, fragrance, and preservatives. Hair consists mainly of the protein keratin, and in general, the sorption of a cosmetic ingredient onto hair is governed by its attraction or binding with the negatively charged composition of keratin amino acids.