Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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blocking powder

A finely ground resin used in dusting over the impressions in silk and velvet before gold tooling. Such resins are used in lieu of GLAIR because moisture would stain the silk or velvet. The powder has the advantage of requiring only a moderately hot tool, whereas glair requires considerably more heat to make the gold adhere. Blocking powder, however, does not provide the solidity of adhesion to gold leaf that is obtainable with a liquid size; therefore, it is generally used only when a liquid size is impractical. (154 )

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