Process for quenching or suppressing the fluorescence of optically brightened substrates.

摘要

A process for quenching or suppressing the fluorescence of substrates treated, or to be treated, with optical brighteners and consisting of natural or synthetic polyamides with UV absorbers is described, which is characterised in that a sulphonated UV absorber of the formula …… in which X, R1, R2 and R3 have the meaning stated in Patent Claim 1, is applied to and fixed on these substrates before or after the optical brightening process.