4328. To Dissolve Iodine in Cod Liver Oil

4328.      To Dissolve Iodine in Cod Liver Oil. To effect this it is best to triturate the iodine with half its weight of iodide of potassium, and to add gradually the oil so as to form a uniform mixture. After standing for a few hours all the iodide will be found at the bottom of the flask, leaving the iodine in perfect solution, the oil having but little of its taste. (Eymael.)

4329. Tests for Iodine

4329.    Tests for Iodine. Free iodine may be recognized by — The violet color of its vapor. - Striking a blue color with starch; this test is so delicate that water containing only 1/400000 part of iodine acquires a perceptible blue tinge on the addition of starch. - Nitrate of silver causes a white precipitate in solutions containing iodine. - It strikes a blue color with opium and narceine. Iodine in combination, as it exists in iodic acid and the iodates, does not strike a blue color with starch, without the addition of some deoxydizing agent, as sulphurous acid or morphia; and as it exists in the iodides, not until the base is saturated with an acid (as the sulphuric or nitric), when iodine being set free, immediately reacts upon the starch. An excess of either acid or alkali destroys the action of the test. By mixing the liquid containing the iodine with the starch and sulphuric acid, and lightly pouring thereon a small quantity of aqueous chlorine, a very visible blue zone will be developed at the line of contact. (Balard.) Solutions containing iodates yield, with nitrate of silver, a white precipitate, soluble in ammonia; the iodides, under the same circumstances, give a pale yellowish precipitate with nitrate of silver, scarcely soluble in ammonia; a bright yellow one with acetate of lead; and a scarlet one with bichloride of mercury. The iodates deflagrate when thrown on burning coals, but the iodides do not. The iodates may also be tested as iodides, by first heating them to redness, by which they lose their oxygen, and are converted into iodides.

4330. Kelp

4330.    Kelp. The alkaline ashes obtained by burning various kinds of sea - weed.

4331. Galipot

4331.    Galipot. A French term for that portion of turpentine which concretes on the trunk of the tree when wounded, and is removed during the winter.

4332. Phosphorus

4332.     Phosphorus. Phosphorus is a pale yellow, semi-transparent, and highly combustible solid; specific gravity 1.77 (water standard); melts at 108° Fahr., and unites with oxygen, forming acids, and with the metals, forming phosphides or phosphurets. It is soluble in ether, naphtha, and the oils. From its great inflammability it can only be safely kept under water. In commerce it is always packed in tin cylinders, soldered airtight. It is a powerful corrosive poison. The specific gravity of its vapor is 4.327 (air standard).