| abstract |
Field of the Invention The present invention relates to bleaching stone substrates comprising an anhydrous nitrile-containing compound in which the nitrile is coupled through a methylene moiety (which may be substituted by one or both hydrogens), a quaternary nitrogen genome vapor, and the two valences of the water-borne nitrogen gene form part of a saturated ring. The saturated ring contains 2 to 8 carbon atoms outside the quaternary plant. For the purpose of bleaching, the nitrile is reacted with an active xenon crack. Particularly preferred nitrile-containing compounds are N-alkylmerculinic acrylonitrile salts. |