photochemical

1. not comparablechemistryOf, relating to, or produced by photochemistry or by photochemical reactions.

   The O–O bond in benzoyl peroxide and the C–N bonds in AIBN homolyze under thermal or photochemical conditions.

   2007, Robert B. Grossman, The Art of Writing Reasonable Organic Reaction Mechanisms, →ISBN

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   Between 1826 and 1837, Nicéphore Niépce, credited with taking the first successful photograph, in 1827, and Louis Daguerre, the most famous photographic innovator of his day, found that silver iodide was especially light sensitive, and they used this discovery as the basis for their early work, which even then had begun to gain international notice. By 1842, others found that when sunlight hit a gelatin emulsion containing silver iodide, soon to be called a daguerreotype plate, it induced a photochemical reaction. Practical photography was born.

   2017, Bob Berman, Zapped: From Infrared to X-rays, the Curious History of Invisible Light, Little, Brown and Company, →ISBN, page 72

plural photochemicals

1. Any chemical compound (such as silver halides) used in photography.

   […] Kodak's production of photochemicals, and Sheppard worked out a method of suspending pulverized coal in fuel oil for use in U.S. Navy ships. By the spring of 1918 Sheppard had developed a collodial mixture containing chemical […]

   1990, Douglas Collins, The Story of Kodak, Harry N. Abrams, →ISBN, page 151

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   Troubleshooting emulsion artifacts: Many problems will be averted by consulting Kodak materials and Reference 4 before the first experiment. Because nuclear track emulsions are very sensitive to chemical contaminants, especially metals and photochemicals, Kodak recommends three controls for every experiment: blank, charged slides (no tissue), charged slides with unlabeled tissues (not hybridized), and charged slides with hybridized (radioactive) tissue sections.

   2000, John P. Sundberg, Dawnalyn Boggess, editors, Systematic Approach to Evaluation of Mouse Mutations (Research Methods For Mutant Mice), CRC Press, →ISBN