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Optical Brighteners: Paper
When we think of paper, especially historical paper, we tend to think of white paper. We think of the fine white paper used for books, or for letters or manuscript … Read More
Dyebath Acidity and Litmus
Many organic dyes, what the eighteenth-century colour-makers called “vegetable” colors, are sensitive to the alkalinity or acidity of the dyebath. I have elsewhere shared the range of bright reds and … Read More