Glossary
sandstone
A sedimentary rock formed by the compacting of grit or sand with a high silica content bound in a natural cement-- the silica itself. Many types of sandstone are soft and easily eroded, but some are quite hard and durable. Sandstone is generally more difficult to carve than limestone, for the particles wear down the metal of the chisel. Some sandstone can be polished.
xylography
A printing technique that involves carving text in relief upon a wooden block. When inked, the impression is transferred to paper. The oldest known printed works were produced by this method in Japan and China during the 8th and 9th centuries. This method of wood-block printing appeared in Europe in the 14th century and eventually inspired Johannes Gutenberg to create type pieces out of metal.
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