Today, professional whitening techniques go to work on the tooth structure itself, using peroxide to oxidize and decolorize gray and yellow tooth pigments.
But the rate of the reaction, after decolorisation varies greatly.
Electrochemical decolorisation is based on the principle that electrons in an electric current split textile dyes into smaller, colourless parts that are more readily biodegradable.
The slide was then washed with tap water, decolorized with 0.5% HCl-alcohol (TB Decolorizer F, BBL Microbiology Systems), and washed again with tap water.
A number of reports discourage the azo dye decolorisation by microorganism under anaerobic conditions as it leads to the formation of corresponding aromatic amines.
Cytologic smears containing granulomas can be decolorized after initial examination and restained with AFB stain for mycobacteria and silver stain for fungal elements.
Parameters such as suspended solids, the degree of decolorisation and removal of COD were measured before and after treatment.
Indirect IS-PCR was carried out for the same patients to detect the HPV DNA types 6/11 and 16/18 after the PAP-stained smears had been decolorized .
The ability to degrade azo dyes varied between lignin peroxidase isoenzymes and optimum pH for decolorization differed between dyes.