Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 113
grada-tions are not always visible to the eye inthe design of the proof; but they never-theless exist in the body of the paper.When a positive succeeds, it presents thedetails which the appearance of the nega-tive would never have led us to suspect,since light by encountering these… … REMARKS ON CERTAIN PHOTOGENIC ANDACCELLERATING SUBSTANCES. ROM the earliest periodof chemical manipulation,the unstability of thecompounds and the saltsof silver, has been thesubject of much observa-This property, most appa-the insoluble precipitates,by a change of color, was soon at-tributed to…
Photography · Art and photography
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