POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Polarised light micrograph of arsenic disulphide crystals (As2S2). Arsenic disulphide, also known as red arsenic, was first observed by Aristotle in 600 BC. Although used for some time as the source of metallic arsenic, it has been supplanted by arsenic trisulphate (white arsenic) over the last 100 years. Magnification x100 at 35mm size.
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