| http://www.w3.org/ns/prov#value | - aser light of at least 15 and preferably 50%.The layer may be formed of any suitably reflective material, metals being particularly suitable with aluminium being preferred to others on the basis of cost, and may be applied by conventional means such as vapour deposition or sputtering.The invention will be more readily understood from the following examples.EXAMPLE 1Dye coat and receiver coat solut
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