GLOSSARY

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N

nanometres (nm)

A very small measurement, one/1,000,000,000th of a metre, used when referring to the wavelength ranges of the electromagnetic spectrum.

networking

a) Connecting and interacting with other groups of common interests.

b) Connecting computer systems to each other to exchange information either in-house, locally or through world-wide networks like the Internet.

nitrate film

Photographic film with a film base composed mainly of cellulose nitrate. Because cellulose nitrate film is highly unstable, subject to oxidation and denitrification, and extremely flammable, it has been replaced by acetate and polyester-based films. See also Cellulose nitrate.

non-buffered

Refers to materials which do not have any alkaline substances added to their ingredients in order to neutralise acids. Alkaline buffers are added to papers and boards to chemically neutralise acids. Hence alkaline buffers are generally seen as protective. However, some materials, such as colour photographs, can be adversely affected by the alkaline buffering, and non-buffered papers are recommended for use with these items. See also Acid free; Alkaline buffering.