Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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methyl magnesium carbonate

An organic compound, (CH 3 OMgOCO 2 CH 3 . xCO 2 ), with x being variable depending on the solvent used. It is prepared by treating a solution of magnesium methoxide with carbon dioxide until saturation is attained. The resulting solution is clear, colorless, and has a pH of approximately 7.0. It has been recommended as a non-aqueous deacidifying agent for paper, preferably in low concentrations, e.g., 0.7 to 1.0%. Its advantages are said to be: 1) a mild pH, due to the neutral character of the solution and direct conversion to magnesium carbonate upon hydrolysis; and 2) convenience of use due to the decreased sensitivity of the solution to water, which assists in preventing premature precipitation.

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