Glossary

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GSM

GSM stands for grams per square metre. It is the standard measurement used for weighing paper and board stocks.  It is a measure of paper density and useful in applications that use heat such as digital presses and foil stamping.

The gutter on a book is the inside fold of a cover hinge where it meets the book block spine. Also the “valley” between two pages when a book is open that forms the inside page margins.