During the mid-twentieth century, archivists frequently treated fragile paper documents with cellulose acetate lamination, a technique that bonded transparent thermoplastic film to both sides of a document using heat and high pressure to prevent mechanical tearing. However, conservation scientists later discovered that degrading cellulose acetate releases acetic acid. When trapped within the laminated layers, this acid significantly accelerates the degradation of the underlying cellulose fibers of the paper. Consequently, contemporary archival guidelines prohibit cellulose acetate lamination, recommending instead that vulnerable documents be placed inside non-adhesive, chemically inert polyester sleeves that provide reversible physical protection without the application of heat while allowing chemical off-gassing.
Based on the passage, which of the following statements are logically supported by the text? (Select all that apply.)
- The long-term chemical effects of cellulose acetate lamination can accelerate document deterioration rather than solely protecting against physical damage.Cevap
- BCellulose acetate was initially adopted in archives because it was less flammable than earlier nitrocellulose coatings.
- Modern conservation protocols value enclosure methods that avoid subjecting fragile paper to heat during the preservation process.Cevap
- DEnclosing documents in polyester sleeves completely halts all natural aging and chemical decay in historical paper.
- EMid-twentieth-century archivists applied cellulose acetate film primarily to neutralize acidic compounds already present within the paper.