Technical Knowledge folder 3 "Dyes, optical brightening agents – Permanency of paper and board" has been completely revised in recent months and supplemented by a literature index.
Optical brightening agents convert near UV radiation that is not visible to the human eye to visible fluorescence radiation in the violet-blue spectral range (400 to 480 nm). They improve the whiteness of papers in this way. Discover the physio-chemical principles of optical brightening agents and learn how to classify them for the preservation of cultural artefacts.
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