|Why Leather Rots||Environment & Handling||Potassium|
|Why Dress? Which Books?||Precautions||How Often?|
|Acid from air.|
Lack of salts,
|Carefully sponge onto dry leather. Let dry 24 hours,||Rub a little British Museum dressing into the surface.||1) Retards effects of physical wear; 2) consolidates leather. For vellum: wash quickly, & only when nec; dress lightly, polish quickly.|
|USDA 1956 (Rogers & Beebe)||Acid in leather; also, lack of oil or grease in leather; but "Dressings do not protect leather against acid decay."||Wrap valuable, little-used books in cloth or put in box.||6 or 8 different formulas given. Apply snail quantities with hand till no more absorbed. Can use small swab,||More decayed bindings absorb more dressing. Dress or wash to clean the bindings, not to pre- serve then.||"Good judgement must be used,"||Every year or two.|
|Acidity; lack of non-tans.||Control heat and humidity.||Thoroughly cover with it but don't saturate. Dry for 1 hour before oiling,||Neatsfoot oil and lanolin, Apply quite liberally with a paint brush.||To lubricate the fiber bundles; & reduce the dusting of the leather, Dress all the leather books, even the powdery ones.||Avoid get- ting oil on paper or cloth; or water on tooling.||Every 2-5 years, depending on heat & humidity.|
|Library of Congress leaflet|
(scheduled for revision)
|Temp 60° -68°|
& Eli 55-65%. Too low RH is worse than pollution. Keep out of sunlight, Rehumidify when necessary.
|Temp 60° -68° & RH 55-65%. Too low RH is worse than pollution. Keep out of sun- light. Rehumidify when necessary.||Apply with damp sponge or cotton-- not dripping, Dry 1 hour.||NFO & L 60/40-no brush. Several thin coats.||Treatment of powdery books is ineffective but does no harm, Never use pot. lac. on vellum or alum- tawed skins.||Avoid over-moistening or friction over gold. Avoid H2O on bad leather.||Every 2-5 years.|
|AASLH 1977||Impurities left in the leather after tanning process or absorbed by leather.||Control excessive heat &light. Keep humidity above 40% so leather won't crack; filter air.||Don't use on very deteriorated leather, Do turnins. Let dry. Repeat treatment occasionally till we learn for sure that once is enough; also after every washing.||NFO & L (but they like vaseline)|
60/40, Work well into binding, especially the hinges, but not the turn- ins.
|Don't treat with salts or dressing:|
non-leathers, vellum, alum-tawed leather, or suede.
|Protect the text.||Inspect once a year & if dry- looking,
Harold James Plenderleith. The Preservation of Leather Bookbindings. London: Printed by order of the Trustees of the British Museum, 1946. 24 pp.
J. S. Rogers and C. W. Beebe. Leather Bookbindings: How to Preserve Them. U.S. Department of Agriculture, 1956, 8 pp. USDA Leaflet No. 398.
Paul N. Banks. Treating Leather Bookbindings. Chicago: The Newberry Library, 1974. Rev. 4 pp.
Preserving Leather Bookbindings. Washington: Library of Congress, 1975. Preservation Leaflet No. 3. 4 pp.
Donald L. DeWitt and Carol Burlinson. Leather Bookbindings: Preservation Techniques. Nashville: American Association for State and Local History, 1977. Technical Leaflet 98. 8 pp