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| abstract art |
| Any art in which the depiction of real objects has been subordinated or discarded in favor of patterns, lines and color. |
| acid-free foam board |
| A board made of foamed plastic (polystyrene) material sandwiched between coated paper from which the acids have been removed or have been chemically neutralized to raise the pH level above 7 (alkaline). |
| acid-free |
| A vague term, referring to a material with a pH of 7 or higher. Sometimes used incorrectly as a synonym for alkaline or buffered material. Some acidic materials are chemically neutralized with the addition of alkaline products; other materials are processed to remove the acid-producing elements. (Acid-free materials may become acidic over time due to residual chlorine from bleaching, aluminum sulfate from sizing or atmospheric pollutants.) |
| acid-free corrugated cardboard |
| Corrugated board that has been rendered acid-free; may be lignin free and/or buffered to raise the pH to 7 or above (alkaline). Used as a backing board or for making sturdy storage containers for paper art, textiles or other unframed pieces which should be stored in acid-free atmospheres. |
| acrylic box |
| A box-like cover constructed from clear acrylic sheet. |