| Prevention and treatment of mold in library collections with an emphasis on tropical climates: A RAMP study |
|3. Implications for library materials|
|3.1 Vulnerability of materials|
Pastes (made from vegetable starches), glues (made from animal products) and gums (made from vegetable resins) are all subject to mold growth to varying degrees. The use of excessive amounts of adhesives may be one factor in promoting the growth of mold. With regard to the application of adhesives, more in not necessarily better.
Synthetic adhesives, including polyvinyl acetate emulsions (the so called "white glues" which vary enormously in composition and properties), pressure sensitive adhesives on tapes and labels, heat set adhesives such as those used in dry mount papers, and aerosol spray adhesives are more resistant to mold, but not entirely immune. They are solvent based, and therefore dry quickly. However, their poor aging properties and the fact that solvents are required for their removal make them undesireable for the repair of torn or damaged paper.
Despite the possibility of mold, pastes and gums are recommended for mending of paper due to their reversability. Proper application and thorough drying of the adhesive film provided the best protection. Repairs to bindings are perhaps best done with good quality PVA.