The ordinary commercial arsenic is either the naturally occurring form, which is, however, more or less contaminated with other metals, or is the product obtained by heating arsenical pyrites, out of contact with air, in earthenware retorts which are fitted with a roll of sheet iron at the mouth, an
sheet iron הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד