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Gold is now used as an ingredient in skin care products. It is now flaked, liquified and added in moisturizers, sunscreens, eye creams and lip balms. Spa centers also use gold facials, and these are priced around $100 to $1,000. Cosmetic makers cite the use of gold in medicine, it is given to patients with rheumatoid arthritis.
The gold number is the weight in milligrams of a protective colloid which checks the coagulation of 10ml of a given gold sol on adding 1 ml of 10% sodium chloride. Thus smaller the gold number, greater is the protective action. [3] Gold numbers of some materials Gelatin 0.005-0.01 Albumin 0.1 Acacia 0.1-0.2 Sodium oleate 1-5 Tragacanth 2 [4]
The gold number is the minimum weight (in milligrams) of a protective colloid/lyophilic colloid required to prevent the coagulation of 10 ml of a standard hydro gold sol when 1 ml of a 10% sodium chloride solution is added to it. [1] It was first used by Richard Adolf Zsigmondy in 1901.
The utilization of gold in skin care and cosmetics dates back at least to the 1st century B.C in Egypt, where Queen Cleopatra is said to have used masks made from gold to maintain her skin complexion. [16] It was said that she used it every night to enhance her complexion and improve the suppleness of her skin.
A colloid is stable if the interaction energy due to attractive forces between the colloidal particles is less than kT, where k is the Boltzmann constant and T is the absolute temperature. If this is the case, then the colloidal particles will repel or only weakly attract each other, and the substance will remain a suspension.
Thousands of Amazon shoppers have left glowing reviews for the lotion, and it was even voted skin care's 2022 Product of the Year in a 40,000-person consumer survey by data group Kantar. Shoppers ...
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