GLOSERY OF TERMS
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- The width of the mat from the inner to the outer edge.
- mat board core
- The center area of mat board. Usually 1/16 inch thick. It can be standard
or conservation quality.
- mat board cutter
- A tool use to cut windows in mat board.
- mounting board
- Backing material which is used to support the artwork or mount images
when this is necessary. Standard or acid-free foam core is excellent
- non-glare glazing
- Slightly frosted glass or acrylic glazing
to reduce the reflection of light sources, which can create visual hotspots
that may obscure the view of part of the artwork.
- The process of making a solution or material pH neutral
(pH of 7.0). If a material is acidic, it can be neutralized by adding
an alkali or base material. If it is alkaline
or base, it is neutralized byadding an acid. Pure water has a pH
of 7.0, which is considered neutral.
- offset, mat board offset
- The reveal of the bottom mat board
when one mat window is stacked on top of another. A standard offset
between the top and bottom mat is 1/4".
- optical brighteners
- A class of widely varying types of chemical compounds with one common
characteristic, they absorb ultraviolet light and re-emit it as visible
blue and violet wavelengths. Their presence in and on a substrate tends,
therefore, to "whiten" it. They are also known as "fluorescent agents"
because they strongly fluoresce under "black light" (U.V. light of longer
wavelengths). Due to the fluorescent effect and re-emission of blue/violet
visible light, optical brighteners add a "sparkle" or brilliance to
some substrates in addition to their "whitening" effect.
- A measurement that indicates the degree of acidity or alkalinity of
a material. On a scale from 0-14, pH 7.0 is neutral, above 7.0 is alkaline
(acid-free or base), and below 7.0 is acidic. The scale is a logarithmic
progression, meaning 6.0 is 10 times or more acidic than 7.0. pH can
only be measured on water-soluble materials.
- photographic activity test (PAT)
- A worldwide standard (ISO Standard 14523) for archival quality in
photographic enclosures. The test predicts possible interactions between
photographic images and the enclosures in which they are stored. The
PAT is also used to test the components of enclosures, such as adhesives,
inks, paints, labels, and tapes.
- This term is often used to imply that a product will not react adversely
with photographs. There is currently no standard definition or set of
test methods that fully encompass this term. The basis for such a claim
- An acrylic material used instead of glass. It is very light in comparison
to glass and much more resistant to breakage.
- The piece of mat board that is left over when the opening is cut.
When making a triple or thicker mat, often the plug is left in place
to provide a cutting surface for the next mat board.
- A single layer of paper. A term used when several sheets of paper
are laminated together to form a board.
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- The prevention or delay of deterioration of and damage to archival material through appropriate environmental controls and/or treatment; preservation is a broader term than conservation.
- Term used to describe how a frame looks when viewed from one end. It will describe the width and height of the mat, and the dimensions of the rabbet.