CONDITION
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DESCRIPTION
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ABRASION
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Surface area that has been worn away by friction or contact
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ACCRETION
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A solid piece of matter cause by the gradual expansion of a material, often caused by chemical reactions
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BIT ROT
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Slow deterioration in the performance and integrity of data stored on storage media. Also known as data degradation and bit decay
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BLANCHING
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Localised, slightly opaque, white haze on or in a paint or a varnish layer, often caused by chemical damage
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BLISTERING
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Damage to a material which creates a void between a surface layer and an underlying layer or substrate
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BLOOMING
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When used in relation to paint or varnish; a slightly yellow, white or blue/white haze within the material, often caused by moisture damage. When used in relation to metals; a loose, white corrosion product caused by exposure of certain metal types to moisture. When used in relation to mould; a descriptive term for the appearance of mould spores
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BUCKLING
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Cracks in a paint layer that are caused by compression and result in raised ridges
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BRITTLE
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Loss of flexibility causing the object to be easily cracked or broken e.g., paper, leather, parchment
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CHALKING
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Degradation of a paint layer which causes the formation of a powdery deposit, usually caused by exposure of the paint to outdoor elements or an insufficient binding medium
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CHIP
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A small amount of material that has broken away from the main material
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CLEAVAGE
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A separation in a paint layer that is broader than a crack
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COCKLED
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Wrinkled or puckered material caused by uneven drying e.g., paper, fabric
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CORROSION
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Metal oxidation product e.g., rust
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CRACK
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Thin splits in a material that can be either shallow or deep
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CRAZING
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Fine surface cracks through a glaze, varnish or paint layer
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CREASE
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Lines produced by folding and handling sheets e.g., paper
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DENT
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Surface indentations caused by impact
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DISCOLOURATION
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Colour change to all or a part of an object e.g., stains
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DIRT
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Undesirable material (e.g. dust, grass or soot) resting on or ingrained in the surface of another material
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DISTORTION
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Change from original shape and form e.g., twisting, cockling, warping
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FADING
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Loss of intensity of colour
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FLAKING
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Thin pieces or layers of the surface are detached or are at risk of detachment
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FOXING
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Brown spotting on paper caused by fungus, impurities, dampness, acids
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FRAYING
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Loose and/or separating threads
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FRIABLE
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Loose and powdery surface e.g., ochre
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HAIRLINE FRACTURES
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Fine cracks in an object
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INSECT DAMAGE/ACTIVITY
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Signs of insect activity include small holes, grazing (loss in the surface), and deposits of fine, sawdust-like material
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LOSS
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Areas or parts that are missing from the object
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MOULD DAMAGE/ACTIVITY
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Sometimes powdery growth on surface that can cause staining, discolouration and compromise structural integrity
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PUNCTURE
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A small hole through a material
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TARNISH
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Discolouration of a metal surface due to the formation of a thin film of oxide, sulphide or some other corrosion product. Used most often to describe the black corrosion product that forms on silver.
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TEAR
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Separation or split in a material often in areas of weakness following physical damage e.g., paper
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TIDEMARK
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Discolouration that forms at the edges of liquid stains
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YELLOWING
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Yellow discolouration that affects the whole surface of an item, e.g., plastic, varnish, newspaper
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WARPING
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A change in the original alignment of a material, usually caused by temperature or humidity damage
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WRINKLE
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Ridges or furrows in a flexible material, such as paint or varnish, which usually occurs during the drying process
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WATER DAMAGE
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Discolouration and staining caused by liquid spills
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FURTHER RESOURCES