write a report on reasons behind their chemical deterioration.
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Examples of deterioration
The following examples illustrate the common changes that occur in materials as they deteriorate chemically:
flexible organic materials, for example, paper, fabrics and some plastics, often become brittle;
the change in solubility characteristics and loss of flexibility of some adhesives, paint layers, varnishes and coatings;
colour change, for example, dyes fading and becoming discoloured; and
corrosion of metals.
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