21. In medical literature, hydroquinone is considered the primary topical ingredient for inhibiting melanin production. 22. Research has shown hydroquinone and tretinoin to prevent sun-or hormone-induced melasma. 23. However, classic lithographic developers using hydroquinone alone suffers very poor tray life and inconsistent results. 24. In 1880, he introduced hydroquinone . 25. Hydroquinone is thought to be the active toxin in " Agaricus hondensis " mushrooms.26. Hydroquinone has been shown to be one of the chemical constituents of the natural product propolis.27. Hydroquinone , like other benzene, derivatives can cause skin problems and is undesirable in quantity effluent28. Chua said there were only seven skin whitening creams containing hydroquinone registered with the Drug Control Authority. 29. Hydroquinone is sometimes combined with alpha hydroxy acids that exfoliate the skin to quicken the lightening process.30. Some medications have been created that combine 4 % hydroquinone with tretinoin and a form of cortisone.
