| http://www.w3.org/ns/prov#value | - An optical recording medium comprising a substrate and a photosensitive layer thereon, said photosensitive layer containing for every 100 parts by weight of apolymeric binder resin from 20 to 120 parts by weight of an indolinospirobenzothiopyran compound represented by the general formula (I): ##STR12## wherein R.sub.1, R.sub.2 are a hydrogen atom, a halogen atom, an alkyl group having from 1 to 5
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