Explanatory notes
… part of the rocky matter. (2) Unrefined sulphur extracted from mineral sulphur by melting. This process may be carried … of sour crude mineral oils, etc. These recovered sulphurs, sometimes referred to as “purified sulphur”or “precipitated … are known as “sieved sulphur”, “winnowed sulphur”, “atomised sulphur”, etc., according to the process employed …