A fine clay used in papermaking.

A line drawn on artwork that indicates an area for tint laying, positioning of halftones etc, where this must be done at a later stage. May be printing or non-printing.

Aligning the edges of a pile of paper.

Paper made from a particular type of chemical wood pulp, ie kraft pulp. It may be bleached or unbleached and is a strong paper that is largely used for wrapping and packaging; the term comes from the German word for strong. Commonly known as ‘brown paper’.

Chemical wood pulp produced by digesting wood by the sulphate process. Originally a strong, unbleached coniferous pulp for packaging papers, kraft pulp has now spread into the realms of bleached pulps from both coniferous and deciduous woods for printing papers.

Facing board used, for example, as an outer ply in corrugated board.