National Non-Profit Organization that administers the Green-e program and whose goal is to increase the amount of renewable energy used world wide.

Paper manufactured using alkaline papermaking technology. Acid free papers are buffered with an alkaline reserve, such as calcium carbonate, to neutralize acid compounds absorbed from the atmosphere o [..]

Paper manufactured to provide the ultimate resistance against natural aging. The most important characteristics are: no groundwood or unbleached pulp, a minimum pH of 7.5 and additional alkaline reser [..]

Sizes based on traditions/customs that represent the industry standard for a specific paper grade. For example, the basis size of watercolor paper is 22" x 30".

The weight in pounds of a ream (500 sheets) of paper in a given basis size. Thus, a 140 lb. watercolor paper will be one in which a ream of 22" x 30" sheets actually weighs 140 pounds.

Artist Bristol generally describes drawing paper that is pasted. Two or more sheets are pasted together to form 2-ply, 3-ply, etc. Sheets are pasted into bristol to achieve stiffness, strength, and to [..]

A process that takes place at the end of the papermaking machine. The paper is passed through a stack of steel rollers which gives it more uniform thickness (caliper). By varying the number of rolls u [..]

The thickness of a sheet of paper, expressed in thousandths of an inch (.001) or mil.

A term used to describe a moderately textured surface of paper used for watercolor work. 

A decorative feathered edge produced during the papermaking process.