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Atlex Glossary of Terms

Brighteners

Optical brightening agents (OBAs) make paper whiter and increase it's brightness - brighteners remove the off-white or yellowish appearance of the raw materials in the paper.

Brightness

The higher the number the brighter the paper is, the amount of light reflected off the paper

C2S

Coated 2 Sides, this paper can be printed on both sides - also called Duo or "double sided"

Canvas

Usually a blend of cotton and polyester, acid free and pH neutral - print canvas is coated with a special inkjet receptive coating

Dmax

Is the measure of the maximum density black (deepest black) that a paper and ink combination can produce

Fine Art Paper

Is generally (not always) 100% cotton rag, acid free and pH neutral

gsm

Grams per square meter, this is the weight of the paper

Hand Made

Paper made with a wire mesh mould - hand made paper has randomly placed fibers as opposed to machine made papers where the fibers are generally lined up in the same direction - the randomly placed fibers add strength to the paper - generally has a deckled edge in which the paper is thinner as you get nearer to the edge

mil

The thickness of the paper - one mil equals 1/1000 of an inch - example: 12 mil paper equals 0.012 inches

micron

the thickness of the paper - 300 microns is about 0.01181 inches or 11.81 mils

Mouldmade (mould made)

paper made by machines that simulates the hand mould paper process - the mould is really a wire mesh wrapped on a drum

Opacity

the higher the opacity, the less the printing shows through the paper, especially important for C2S (duo) paper

pH value

indicates whether the paper is acidic or alkaline - acidic paper deteriorates over time - buffering the paper lowers the pH by adding alkaline and can increase the life of the paper - calcium carbonate is a common buffer - a pH value should be 7.0 to 10.0

Thickness

usually measured in mils ( 1/1000 of an inch) or mm (millimeters, 0.001 inch = .0254mm ) - please note that a thicker paper does not necessarily mean it is more rigid or heavier than a paper with with less thickness

Weight

inkjet paper is usually measured in gsm, which is how much one square meter of the paper weighs in grams