Word: mercaptan
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Dates: during 1960-1969
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...countless chemicals in his photo lab-but which one? Working day and night under the red darkroom lights, he dabbled with hundreds of dyes and compounds. Finally, on Dec. 7, 1961, he reached up among the rows of bottles and picked a rarely used mixture called mercaptan l-phenyl-5-mercaptotetrazole. When he swabbed the mixture on the film and then developed it, recalls Blake, "it was like going to the race track and hitting the daily double." The payoff: a major advance in photography...