sentences:  Additionally, when dealing with a new acquisition which shows signs of insect damage, the specimen should be quarantined until it can be determined whether the insects are still present before introducing it to the rest of the collection.In some cases, the textiles are weakened not by outside causes such as light or pests, but by chemical reactions taking place within the fabric itself, such as the oxidation of iron-based mordants over time, which can cause darkening and discolouration in the surrounding fibres.One example which is cited frequently throughout the literature is the case of “shattered silk.” During the late nineteenth and early twentieth centuries, many silk manufacturers treated their fabrics with metallic salts (usually containing tin and iron) to give them a heavier, more luxurious feel.