(Also referred to as alkaline). Paper of neutral or basic chemical makeup. Often this paper is brighter and more opaque than traditional "acid" paper. It has a longer shelf life and is therefore often specified for archival reasons.
A neutral pH paper which will not excessively darken with age. Acrylic Synthetic resin used in an emulsion as the binding medium for acrylic colors. Acrylic Paint A water based paint which dries quickly and is available in tubes or bottles.
A paper manufactured to a neutral pH reading. Used for fine art prints, limited edition printing, permanent records and to protect other materials where contact with paper acidity would be harmful.
A paper which does not contain any free acid. Special precautions are taken during manufacture to eliminate acid in order to increase the longevity of the finished paper and to provide a sheet that is suitable for contact with metals.
Paper with no acidity and a slight alkaline content. It is also used for microfiche jackets because of the sensitivity of film to acids. The manufacturing process uses no elemental chlorine.
Paper that contains no free acid.
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 or formed through natural aging.
is any paper having a pH level of 7 or higher. Acid free paper or acid free matting prevents any deterioration of the piece or the mat over time.
The better quality limited edition prints are produced from wood-free papers (usually 100% cotton) and are sized with a synthetic compound know as Aquapel, which is acid free. Quality papers are also buffered with calcium carbonate which prevents the long-term deterioration caused by migration of acid in the paper from the atmosphere. Papers containing wood pulp, alum fixatives and resin sizing are acidic and become yellow and brittle over time.
A paper having no acidity and no residual acid-producing chemicals. Best for archival purposes.
A paper which has no free acid, or a pH of at least 6.5. The use of a synthetic sizing material allows the paper to be manufactured with a neutral or alkaline pH.
Paper manufactured in a neutral or slightly alkaline pH environment to prevent the internal chemical deterioration of paper over time.