| 摘要 |
A master disc for the manufacture of copies which in turn are used for the manufacture of further copies in the form of optically readable information carriers, the master disc comprising a substrate disc which is provided with an optical recording layer which comprises a nitrocellulose binder as well as a dye which is dissolved or finely dispersed in said binder, the dye being a squarylium dye which is used in a quantity of 1-15 wt. % of the binder.
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