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Using soap as skin cleanser
Ancient Egyptians used cleansing materials such as animal and plant oils to remove body oils and facial makeup.
Their priests ritually cleansed their own bodies twice daily.
Several centuries later, soap was invented -- sometime between 600 and 300 BC -- and the Romans took full
advantage of this cleanser. Until the more modern era, soap remained a luxury product for the wealthy -- until the
availability of NaOH in the compounding of soap reduced the cost and increased supply.
The introduction of synthetic detergents in 1948 led to the development of cleansing bars that were much less
irritating than traditional soap bars.
Cleansers are designed to remove oily soils, dirt, sweat, and sebum from skin through the action of surfactants.
Soap-based cleansers have dominated the industry. The manufacture of soap requires formation and neutralization
of fatty acids from plant or animal triglycerides. The alkali alkanoates are further processed into pressed bars.
While high-lathering soap is appealing to consumers, the irritation potential of soap is related to the alkalinity
and fatty acid chain length.
The prevalence of soap-induced irritation remains a topic of debate. This controversial issue created the market for
the liquid cleansers that were developed during the 1990s. Early liquid body cleansers left body skin with a "tight"
feeling. For this reason, moisturizing body washes were formulated. The feeling of tightness is considered to be
related to the removal of lipids from skin and presence of residual surfactant on skin
Most body cleansers on the market today are synthetic detergent products and not true soap. The FDA does not regulate
soap, unless a claim such as antibacterial, antiperspirant, or anti-acne effect is made on the label, in which case it
is considered a drug.
A well formulated skin cleanser helps to maintain healthy skin. Hundreds of millions of people have used soap in the
form of a bar or liquid with comparatively little irritation.
Anionic surfactants are commonly used in cleansers because of their excellent ability to foam and lather. Frequently,
amphoteric surfactants are used in combination with anionic surfactants in liquid cleansers to boost foaming of the
product and because formulators consider amphoteric surfactants to be substantive to skin, acting as skin conditioning
agents
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