6340. To Remove Nitrate of Silver Stains from Woven Tissues

6340.    To Remove Nitrate of Silver Stains from Woven Tissues. According to M. Grimm, chloride of copper completely removes, even from colored woven cotton tissues, stains occasioned by nitrate of silver; the tissue is to be afterwards washed with a' solution of hyposulphite of soda, and next thoroughly washed with water. Prom white cotton and linen tissues, nitrate of silver stains are more readily and effectually removed by applying dilute solution of permanganate of potassa and hydrochloric acid, followed by washing with hyposulphite of soda solution, and rinsing in plenty of fresh water. By these means the use of the highly poisonous cyanide of potassium is rendered unneces-sary. (See Nos. 385 (To Remove Stains made by Hair Dye, or Indelible Ink) and 3141).

6341. To Dissolve Old Blood Stains

6341.    To Dissolve Old Blood Stains. Dr. Helwig recommends a solution of iodide of potassium in four times its weight of water.

6342. Silk Cleaner

6342.    Silk Cleaner. Mix well together 1/4 pound soft soap, a tea-spoonful of brandy, 1/2 pint proof-spirit, and 1/2 pint water. It is to be spread with a sponge on each side of the silk without creasing it; the silk is then rinsed out 2 or 3 times, and ironed on the wrong side. (See No. 460 (To Clean Silks, Satins, Colored Woolen Dresses, etc.).)

6343. Fluid for Removing Grease Stains from Silk, etc.

6343.    Fluid for Removing Grease Stains from Silk, etc.. A fluid for removing greasy stains from silk, etc., may be prepared by mixing 2 ounces rectified spirits of turpentine, 1/4 ounce absolute alcohol, and 1/4 ounce sulphuric ether.

6344. To Remove the Stains of Benzine

6344.    To Remove the Stains of Benzine. In removing grease spots from fabrics by means of benzine or petroleum it often happens that a colored and stained outline of the portion moistened is left. This can be prevented by the application of a layer of gypsum extending a little beyond the moistened region. When dry, the powder is to be shaken and brushed off, when no trace of the spot will remain.

6345. To Clean Silver

6345.    To Clean Silver. To clean silver utensils, blackened by sulphuretted hydrogen, Boettgerrecommendsa boiling saturated solution of borax, or a solution of caustic potash, with some fragments of metallic zinc.

6346. To Clean a Wedgwood Mortar

6346.    To Clean a Wedgwood Mortar. A solution of caustic potash will usually be effectual; this may be triturated in the mortar with fine sand or powdered pumice-stone. Sometimes sulphuric acid will serve a better purpose. Chlorinated lime (chloride of lime) will sometimes remove the color where it is a stain merely.

6347. To Dye Gutta-Percha

6347.   To Dye Gutta-Percha. Dissolve 1 ounce gutta-percha in chloroform, and add 1/2 grain of pure carmine, previously mixed with a little powdered gum and water; then distill off the chloroform and knead well the remaining gutta-percha. In the same way ultramarine, ochre, oxide of chrome, etc., may be used.