Prep. Ether is purified by well washing it with water, digesting it for twenty-four hours with recently burned lime and chloride of calcium, and then distilling it from this mixture with a gentle heat.
Prop. & Comp. Pure ether should have a specific gravity not exceeding 0.720. It does not coagulate the albumen of blood, and is a powerful solvent of a limited number of substances, such as fixed and volatile oils, resins, a few alkaloids, gun cotton, iodine, bromine, bichloride of mercury, etc.
Adulterations. Ether may contain alcohol, which increases its specific gravity, and causes it to coagulate the serum of the blood; water and sulphurous acid may also be present, adding to its weight, and giving it an acid reaction.