Kojic acid was developed as a safer alternative to hydroquinone, however it is less effective at lightening and also carcinogenic.
42.
Hydroquinone does not bleach the skin but lightens it, and can only disrupt the synthesis and production of melanin hyperpigmentation.
43.
Products containing more than two per cent hydroquinone have been scheduled as Part 1 Group C Poisons under the Poisons Act 1952.
44.
The beetles'glands store enough hydroquinone and hydrogen peroxide to allow the beetle to release its chemical spray roughly 20 times.
45.
Normally, it is supplied with 1-2 % of the hydroquinone as an additive to prevent oxidation of the compound.
46.
Hydroquinone is the active ingredient commonly found in skin whiteners used for removing dark spots on the face or to produce lighter complexion.
47.
However, the staining effect only appears in solutions with very little sulfite, and most hydroquinone developers contain substantial quantities of sulfite.
48.
Because COT is unstable and easily forms explosive organic peroxides, a small amount of hydroquinone is usually added to commercially available material.
49.
Impure samples are often dark-colored due to the presence of quinhydrone ( 1 : 1 complex of quinone with hydroquinone ).
50.
Hydroquinone is a strong inhibitor of melanin production, meaning that it prevents dark skin from making the substance responsible for skin color.
