D

Deacidification

A common term for a chemical treatment that neutralises acid in a material such as paper, and that may deposit an alkaline buffer to counteract future acid attack. While deacidification may increase the chemical stability of paper, it does not restore strength or flexibility to brittle materials.

Dehumidifier (adj: dehumidification)

Equipment that reduces the humidity in the atmosphere by the use of refrigeration, desiccants or absorbent drying agents.

Deterioration

Damage caused to an item by physical, chemical or biological means.

Diazo film

A type of microform in which the active component is a light sensitive diazo dye. It is recommended for duplication and use copies of microfilm since it is less expensive than silver halide film. However, it is not considered archival and original microfilming should be undertaken using silver halide film

Disaster plan

A document setting out procedures to be followed by an organisation to prevent or minimise the risk of a disaster occurring, and to describe actions to be taken should a disaster occur. Such a plan will normally include provisions for the prevention of a disaster; salvage procedures in case a disaster should occur; and replacement/restoration measures to be taken. More correctly should be called a disaster preparedness plan.

Durability

The degree to which a material retains its physical properties while subjected to stress: such as heavy use, or adverse environmental conditions. To say a material is durable suggests that it has high initial strength, and will last a long time under normal conditions of use.