Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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citric acid

A colorless, crystalline or white powdery tricarboxylic acid (C 6 H 8 O 7 ). Citric acid is used to remove ink, and similar stains from paper, and is particularly useful in removing iron stains. Its advantage over chlorine solutions is that, being a weak and volatile organic acid, it is much less damaging to the paper.

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