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US06541177B1 Diffusion transfer photographic film unit 失效
扩散转印摄影胶片单位

Diffusion transfer photographic film unit
摘要:
A self-developing diffusion transfer photographic film unit which includes a latent image which becomes visible upon photographic processing of the film unit. The latent image is formed with a chemical compound such as an indicator dye and the visible image formed from the latent image as a result of photographic processing may be transient or permanent. Also described are diffusion transfer photographic methods.
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