BS 4971:2002 pdf download

BS 4971:2002 pdf download.epair and allied processes for the conservation of documents —Recommendations.
3.45
membrane
single skin, or part of a skin, of parchment or vellum
3.46
non-ionic detergent
synthetic chemical which reduces the surface tension of water thus enabling it to penetrate paper easily
3.47
non-woven polyester
open, heat .sealed web of polyester fibres used to support documents during treatment
3.48
parchment thong
long narrow strip of twisted parchment on which loose parchment or paper documents are threaded, or narrow strips of parchment on which sections of books can be sewn
3.49
pH value
point on a logarithmic scale showing the concentration of hydrogen ions in a solution
NOTE This i.u4 Lo ikna scidii or alkslzn,ly ao . st u ito 14. iwutrol brjn pH 7.
3.50
pigment
insoluble particles of a coloured material in suspension in a fluid which, after application, evaporates leaving a solid surface coating of the particles
3.51
pressure sensitive adhesive
adhesive that produces a tacky film which readily adheres to a material after a brief application of pressure
3.52
propolis
reddish resinous substance collected by bees from the buds of trees t.o consolidate the interior of their hives
3.53
preservation
all management, financial and technical issues involved in preserving archive and library materials in all formats. andlor their information content, so as to maximize their useful life
3.44
reagent grade
grade otchemicul commonly used for laboratory work when small amounts of impurities will not harmfully affect the behaviour of the reagent
3.55
reconstituted collagen
re-hydrated natural protein of skin, bone and connective tissues used in parchment repair
3.56
relative humidity
ratio of the absolute humidity to the maximum possible density of water vapour in the air at the same temperature, expressed as a percentage
3.57
relaxation
process of making a document more flexible to rectify over.tight folding, creasing, cockling or distortion, without strain or damage
3.58
release paper
paper coated with a stable layer of material, such as a silicone resin, to which other substances, including adhesives, do not stick permanently
3.59
repair
techniques and/or materials applied to a document in order to make it usable
3.60
reprographic method
process which allows reproduction from an original
NOTK The mst common reprngraph.r methoda are rretroatatc copying. photography and mirrolilming.
361
restoration
process used in reconstructing damaged archive and library materials to a perceived original form NtYI’E It da net necessarily include rood coeaemidion pract (sa
3.62
reversible
status that will allow certain treatments to bc reversed, as far as is possible, allowing a document to be returned to its pre-treatment condition
3.63
size
substance used to strengthen paper and to decrease its absorbency
3.64
spanish wax
compound of cinnabar and colophony resin
3.65
substrate
carrier holding the information media
3.66
surfactant
substance that alters the interfacial tension of water and other liquids or solids
3.67
tub-sized paper
newly formed paper which has been immersed in gelatin size, as opposed to surface coating
3.68
ultrasonic humidification
production of a tine cold mist of water using ultrasonic equipment which is then used for relaxing parchment or paper without directly wetting it
3.69
vacuum desiccator
glass container connected to a vacuum pump
OTK This is used dunn5 treatment to mncuatr air from a fñabki sc.I.
3.70
vacuum table
perforated flat surface that allows documents to be supported under tension using a vacuum created below the surface
3.71
wetting agent
substance which lowers the surface tension of water and is used in washing to aid the removal of soluble substances from paper
NOTI F.*bnnol. ncrlone nnd nan Ic,nic drtrrrnti nuic iI1 1w ujied i wcttin5 n5cni*
4 General principles
4.1 Maintaining the integrity of documents
Custodians of archive and library materials are responsible for maintaining the integrity of the documents in their care. This means preserving the textual, pictorial and physical content and character of the documents.
Changes to the original arising from unnecessary or inappropriate conservation interventions can destroy unique and important evidence of the document’s status, production, historical context and provenance. This compromises the document’s value to research, and in the cast’ of an archival document undermines its legal authenticity.
Owing to the above considerations, the option to conserve a document should be very carefully considered and taken after consultation between curatorial and conservation experts. It should be viewed as a final option in an overall collections care programme, which in the first instance should employ preventive techniques (effective environmental control, good handling practices, protective enclosures, substitutes) to prevent and reduce deterioration of the document from its original condition. An effective collections care programme should ensure that documents that have received conservation treatment are returned to a protective environment.
A collection that has remained virtually undisturbed might have a special historical value or significance and should therefore be treated as a whole, and not ass collection of individual items.