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en.wikipedia.org/wiki/Arsenic

Two arsenic pigments have been widely used since their discovery – Paris Green and Scheele's Green. After the toxicity of arsenic became widely known, these chemicals were used less often as pigments and more often as insecticides. In the 1860s, an arsenic byproduct of dye production, London Purple was widely used.

www.rsc.org/periodic-table/element/33/arsenic

Discovery date, approx 1250. Discovered by, Albertus Magnus. Origin of the name, The name is thought to come from 'arsenikon', the Greek name for the yellow pigment orpiment. Allotropes, Yellow As, Grey As, Black As ...

education.jlab.org/itselemental/ele033.html

Although arsenic compounds were mined by the early Chinese, Greek and Egyptian civilizations, it is believed that arsenic itself was first identified by Albertus Magnus, a German alchemist, in 1250. Arsenic occurs free in nature, but is most often found in the minerals arsenopyrite (FeAsS), realgar (AsS) and orpiment ...

www.webelements.com/arsenic/history.html

Arsenic compounds were mined by the early Chinese, Greek and Egyptian civilisations. No doubt they discovered its toxic properties early on. It is believed that Albertus Magnus obtained the element in 1250 A.D. who obtained it by heating soap together with orpiment (arsenic trisulphide, As2S3). Arsenic is one of the ...

www.chemistryexplained.com/elements/A-C/Arsenic.html

Since arsenic is somewhat similar to mercury, early scholars probably confused the two elements with each other. Credit for the actual discovery of arsenic often goes to alchemist Albert the Great (Albertus Magnus, 1193-1280). He heated a common compound of arsenic, orpiment (As 2 S 3 ), with soap. Nearly pure arsenic ...

www.livescience.com/29522-arsenic.html

Jul 28, 2016 ... Arsenic is a crystalline metalloid found in the Earth's crust, but in its free form it is quite rare. The element is typically found in minerals, such as arsenopyrite, realgar and orpiment, according to the Minerals Education Coalition. Arsenopyrite (FeAsS), an iron arsenic sulfide, also called mispickel, is the most ...

www.chemicool.com/elements/arsenic.html

Arsenic Element Facts. Data Zone | Discovery | Facts | Appearance & Characteristics | Uses | Abundance & Isotopes | References. 33. As. 74.92. The chemical element arsenic is classed as a metalloid. It has been known since ancient times. Its discoverer and discovery date are unknown.

www.lenntech.com/periodic/elements/as.htm

Arsenic can be found naturally on earth in small concentrations. It occurs in soil and minerals and it may enter air, water and land through wind-blown dust and water run-off. Arsenic in the atmosphere comes from various sources: vulcanoes release about 3000 tonnes per year and microorganisms release volatile ...

www.dartmouth.edu/~toxmetal/arsenic/history.html

Jul 21, 2016 ... Albertus Magnus is usually accredited with the discovery of arsenic around 1250. Since the very earliest of times poisons have been used as a means for settling old scores, instruments for personal advancement, as a means to execute criminals and by those who found life to be an intolerable burden.