- Philo-Tinctorius to the Chemistry Committee of the Society of Arts, 3 December 1765. In this letter, an anonymous inventor described his efforts to improve colormaking, and, perhaps, win a prize from the Society of Arts. Philo-Tinctorius discussed his research and offered a chemical rationale, based on Stahl and Hellot, for the experiments he performed, as well as the practical considerations behind his undertaking. Credit: 4 pages - Courtesy Archives of the Royal Society of Arts, London. Guard Book PR.GE/110/19/52.
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