In a busy workshop a medical chemist wearing a physician’s cap performs a uroscopy. He consults an open book, while at the right a woman and a man await the results. In the background a patient undergoes a dental procedure, with three people watching. In the far right a man enters the room, holding a flask. A distillation apparatus can be seen at the bottom right.
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Merck litmus paper, 1934
©2010 Chemical Heritage Foundation