Bleaching agents that do not contain chlorine most often are based on peroxides, such as hydrogen peroxide, sodium percarbonate and sodium perborate.
32.
In the U . S ., the typical concentration for benzoyl peroxide is 2.5 % to 10 % for both bleaching agent.
33.
Palladium and nickel act as primary bleaching agents for gold; zinc acts as a secondary bleaching agent to attenuate the color of copper.
34.
However, despite its name, " Borateem " laundry bleach no longer contains any boron compounds, using sodium percarbonate instead as a bleaching agent.
35.
Palladium and nickel act as primary bleaching agents for gold; zinc acts as a secondary bleaching agent to attenuate the color of copper.
36.
Chlorine dioxide is a popular bleaching agent in wood pulp and has been used in recent years to disinfect thousands of water supplies in America.
37.
Hydrogen peroxide is by itself a strong bleaching agent and should be used only in diluted form, such as a 3 % solution in water.
38.
Environmentalists have been calling for the industry to abandon chlorine altogether as the bleaching agent it uses to remove the brownish color from wood pulp.
39.
The FDA official said the illegal cosmetics continue to be sold because of the low cost of the chemicals and the popularity of skin bleaching agents.
40.
Chlorine was introduced in 1889 but scientists later found that the most effective bleaching agent was hydrogen peroxide which was actually first experimented upon in 1884.
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