I haven't located the book I'm looking for yet but did find a page from a different document that states:
Preservation and restoration of natural leather and other tanned animal hides.
Excludes: Aquatic and all non-fur-bearing skins/hides unless otherwise directed.
Prepare a mixture consisting of:
1.0 pound anhydrous lanolin
2.0 fluid ounces Cedar oil
1.0 ounce clarified beeswax
20 fluid ounces hexane
(If available for procurement, “British Museum Leather Dressing” may be used.)
Usage-
Apply mixture sparingly with an uncolored lint-free cotton cloth using a rubbing action sufficient to work mixture into the surface but extreme care should be taken to prevent flexing of the leather or damage to the surface. Article should be maintained in an atmosphere of 65-75°F with a relative humidity of 45-70%. When possible, article should be suspended in such a manner as to prevent damage or strain while allowing unrestricted airflow to all treated surfaces as best as can safely or effectively be achieved. Exterior surfaces of treated article should rest a minimum of 60 hours before reapplying treatment. Interior treated surfaces should rest a minimum of 100 hour before reapplying treatment. Articles must be allowed to rest for 30 days following the third sequential treatment to prevent saturation, sequential process may repeated as necessary. Articles must be isolated from general inventory and/or display areas for the duration of the cleaning and treatment process plus a minimum of 10 days to help mitigate contamination or exposure concerns. Articles shall not be returned to static display cases nor any other display or storage area without positive airflow for a minimum of 30 days following final treatment.
