Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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Lofton-Merritt stain

A test used to determine the presence of unbleached sulfate or sulfite fiber in paper. The stain consists of two grams of malachite green in 100 ml. of water, plus one gram of basic fuchsin in 100 ml. of water, 50 ml. of the former being mixed with 100 ml. of the latter. The specimen is treated with a drop of the mixture and then with a 0.1% solution of hydrochloric acid, followed by the application of distilled water. A blue or blue-green stain indicates the presence of unbleached sulfate fiber, while purple or lavender indicates unbleached sulfite. (143 )

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