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Encyclopedia > Bleaching agent

A bleaching agent is any compound that bleaches the colour out of fabrics, paper, or other materials. Household bleach or sodium hypochlorite is used in the home for whitening clothes, removing stains, and disinfecting. This is because sodium hypochlorite yields chlorine radicals, oxidizing agents readily reacting with many substances. Fabric can refer to: Cloth Fabric, a London dance club This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Piece of paper Paper is a thin, flat material produced by the compression of fibres. ... Sodium hypochlorite is a chemical compound with the formula NaClO. A solution of sodium hypochlorite is frequently used as a disinfectant and as a bleaching agent; indeed, often it is simply called bleach though other chemicals are sometimes given that name as well. ... Stain has several possible meanings: A stain can be an unwanted localized discoloration, often in fabrics or textiles. ... Infection is also the title of an episode of the television series Babylon 5; see Infection (Babylon 5). ... General Name, Symbol, Number chlorine, Cl, 17 Series halogens Group, Period, Block 17 (VIIA), 3, p Density, Hardness 3. ... The word radical can have two distinct meanings in chemistry. ... An oxidizing agent is a substance used in electrochemistry that oxidizes another substance. ...


Hair bleach on the other hand contains H2O2 (hydrogen peroxide), which gives off oxygen radicals as it decomposes. Oxygen and chlorine radicals both have comparable, and excessive bleaching effects. <!-- Use It is commonly used (in very low concentrations, typically around 5%) to bleach human hair, hence the phrases peroxide blonde and bottle blonde. ... General Name, Symbol, Number Oxygen, O, 8 Chemical series nonmetals Group, Period, Block 16 (VIA), 2, p Density, Hardness 1. ...


Disadvantages of chlorine

A problem with chlorine is that it reacts with organic material to form trihalomethanes like chloroform, which is a well known carcinogen. Trihalomethanes (THMs) are chemical compounds in which three of the four hydrogen atoms of methane (CH4) are replaced by halogen atoms. ... Chloroform (also known as trichloromethane and methyl trichloride) is a chemical compound with formula CHCl3. ... In pathology, a carcinogen is any substance or agent that promotes cancer. ...


Chlorine is a respiratory irritant. It also attacks mucus membranes and burns the skin. As little as 3.5 ppm can be detected as an odor, and 1000 ppm is likely to be fatal after a few deep breaths. Exposure to chlorine should not exceed 0.5 ppm (8-hour time-weighted average - 40 hour week.) Evolution of a 2nd degree burn — One hour Evolution of a 2nd degree burn — One day Evolution of a 2nd degree burn — two days In medicine, a burn is a type of injury to the skin caused by heat, electricity, chemicals, or radiation (an example of the latter is sunburn). ...


Chlorine from typical CFCs like trichlorofluoromethane, which is stable, but reaches the ozone layer, is one of the two radicals formed there: the highly reactive chlorine atom, much more than the dichloromethyl radical, initiates the dreaded step in the ozone degradation chain reaction. For other uses, see CFC (disambiguation). ... R-11, or trichlorofluoromethane, was the first widely used refrigerant. ... The ozone layer is that part of the Earths stratosphere which contains relatively high concentrations of ozone (O3). ...


  Results from FactBites:
 
Aqueous bleaching agent suspensions containing peroxycarboxylic acid, method for their preparation and use - Patent ... (4625 words)
A storage-resistant, pourable to pasty aqueous bleaching agent suspension having a pH between approximately 1 and approximately 6 comprising an aqueous carrier liquid, a particulate, substantially water-insoluble peroxycarboxylic acid, an organic thickening agent, an acidifying agent and a hydrate-forming neutral salt which densensitizes peroxycarboxylic acids, the thickening agent comprising a xanthan polysaccharide or agar polysaccharide.
A bleaching agent as set forth in claim 14 in which the hydrophilized peroxycarboxylic acid is obtainable during the preparatio of peroxycarboxylic acid from the base acid or its anhydride and hydrogen peroxide in the presence of sulfuric acid.
The bleaching agent suspensions of the invention contain a hydrate-forming neutral salt in an amount of approximately 1 to approximately 40% by weight, preferably 2 to 20% by weight, calculated hydrate-free and in relation to the suspension, or the purpose of increasing the storage resistance of the suspension and desensitizing the peroxycarboxylic acid.
ADA.org: Oral Health Topics: Tooth Whitening Treatments Frequently Asked Questions (636 words)
If you are a candidate for bleaching, your dentist may suggest a procedure that can be done in his or her office.
A bleaching agent is then applied to the teeth, and a special light may be used to enhance the action of the agent.
A number of in-office bleaching agents have the ADA Seal of Acceptance, your assurance that they have met ADA standards of safety and effectiveness.
  More results at FactBites »

 

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