LABEL PAPERS
A large variety of plain or colored body papers that are made to be gummed, or for application of a self-adhesive material, and subsequently cut into a vast number of shapes and sizes depending on end use and surface application.

LAID LINES
A continuous watermark consisting of very close parallel lines, generally associated with spaced lines (chain lines) at right angles to these.

LAMINATE
Overlay of sheets of paper or board either with other paper or board or with other materials such as plastic or metal foil to form a product with special qualities.

LICK COATING
A light form of mineral coating, achieved by supplying the surface sizing press of the papermaking machine with coating material instead of normal surface sizing solution.

LIGNIN
A substance in wood that binds its fibers together and reinforces its structure. Lignin is removed in the manufacture of chemical pulp.

LITHOGRAPHIC PRINTING
A planographic printing process in which the non-image areas of the printing plate are made hydrophillic and the image areas are made hydrophobic.

LOADING
White, inert mineral matter such as China Clay, Calcium Carbonate, Titanium Dioxide, etc., added to the papermaking stock to confer opacity on the finished paper. Loading may also beneficially affect flatness and dimensional stability.

LONG GRAIN
See Short Grain.

LOOK-THROUGH
The appearance of the paper when held up to transmitted light. It discloses whether the formation is even and uniform or lumpy and "wild." For book publishing papers, a regular, even look-through is desirable, indicating a well-made, uniform sheet.