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Hair straightening is a hair styling technique used since the 1890s involving the flattening and straightening of hair in order to give it a smooth, streamlined, and sleek appearance. [1] It became very popular during the 1950s among black males and females of all races.
The Chemical Abstracts Service (CAS) [13] lists formaldehyde (50-00-0 [14]) and methylene glycol (463-57-0 [15]) as two different substances. The compounds have two different chemical structures, exist in two different chemical families and exhibit different physical properties. Formaldehyde is a colorless gas with chemical structure HCHO.
Cosmetology (from Greek κοσμητικός, kosmētikos, "beautifying"; [1] and -λογία, -logia) is the study and application of beauty treatment.Branches of specialty include hairstyling, skin care, cosmetics, manicures/pedicures, non-permanent hair removal such as waxing and sugaring, and permanent hair removal processes such as electrology and intense pulsed light (IPL).
Hair damage can be further exacerbated by the use of chemical products used for chemical straightening. The study's findings support recommendations to wear looser hairstyles and avoid keeping braids and extensions for more than a few months. [61] Certain products (hair dyes, hairsprays, bleaches, etc.) may contain allergenic ingredients.
The scalp can suffer severe chemical burns if over exposed to lye or no-lye relaxers. A lye relaxer consists of sodium hydroxide (also known as NaOH or lye) mixed with water, petroleum jelly, mineral oil, and emulsifiers to create a creamy consistency. On application, the caustic "lye cream" permeates the protein structure of the hair and ...
Garrett Augustus Morgan Sr. (March 4, 1877 – July 27, 1963) was an American inventor, businessman, and community leader.His most notable inventions were a type of three-way traffic light, [1] and a protective 'smoke hood' [2] notably used in a 1916 tunnel construction disaster rescue.
Process safety is an interdisciplinary engineering domain focusing on the study, prevention, and management of large-scale fires, explosions and chemical accidents (such as toxic gas clouds) in process plants or other facilities dealing with hazardous materials, such as refineries and oil and gas (onshore and offshore) production installations.
The Society of Chemical Manufacturers and Affiliates, is an international trade association that represents the interests of the batch, custom and specialty chemical industry. According to the organization’s charter, SOCMA's stated mission is to "accelerat[e] the potential for members' growth," "increase[e] public confidence in the batch ...