发明授权
US4448873A Negative working diazo contact film 失效
负极工作重氮接触膜

Negative working diazo contact film
摘要:
A photographic element comprising a transparent support and a coating on the support comprising a diazonium composition having a light absorbency of about 45% or less, and a colorant composition, said coating having a light transmission of not more than about 0.1%.
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