Tag Archives: chemistry

the importance of being fixed

Posted on November 25, 2022 by Robert

Toronto. By 1802, the sensitivity of silver halides to light was known in scientific circles. Thomas Wedgwood managed to make ‘photograms‘ – silhouettes on leather but could not make the photograms permanent. The delicate images – even kept in darkness … Continue reading →

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liquid silver

Posted on August 7, 2022 by Robert

Toronto. In the days of films and glass plates, the job of a developer solution was to  convert the silver halides in the emulsion to metallic silver in proportion to the light intensity hitting the molecules. The process had to … Continue reading →

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PHSC News for March 2021 (Vol 20-09)

Posted on March 13, 2021 by Robert

Toronto. At right top of page 1 in this issue is the FLIR Scout TK camera – digital technology with a twist! This tiny digital device records the thermal image of the viewed scene! As the third month of 2021 … Continue reading →

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a fine balance

Posted on January 10, 2021 by Robert

Toronto. I began to take photographs in grade school when someone gave me a simple box camera. In high school, I joined the camera club and began to print and process my own photos. Once I started working, I decided … Continue reading →

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