Chemistry of the Household Volume 4

Chemistry of the Household Volume 4

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ...colored earth. Spots of paint, then, must be treated with something that will take out the oil, leaving the insoluble coloring matter to be brushed off. Turpentine is most generally useful. Spots of varnish or pitch may be dissolved by the use of the same solvents as paint. Alcohol is also one of the best solvents here. Spots made by food substances are greasy, sugary, or acid in their nature. Whatever takes out the grease will generally remove the substance united with it, as the blood in meat juices. Sugar is dissolved by hot water, so sticky spots are best removed with this, ink spot Ink spots are perhaps the worst that can be encountered, because of the great uncertainty of the composition of inks of the present day. When the character of an enemy is known, it is a comparatively simple matter to choose the weapons to be used against him, but an unknown enemy must be experimented upon and conquest is uncertain. Indelible inks formerly owed their permanence to ink silver nitrate. Now many are made from aniline black solutions and are scarcely affected by any chemicals. The silver nitrate inks become dark in the sun by a photographic process. Many silver salts, and some salts of other metals, change in color in a bright light. Indelible Ink Silver nitrate inks may be removed by bleaching powder solutions. The chlorine in this replaces the nitric acid forming white silver chloride. This will darken if not at once removed, but will dissolve in strong ammonia water or a solution of hyposulphite of soda. This last salt, much used by photographers, commonly called "hypo," will often dissolve the stain of indelible ink without the use of the bleaching fluid and is less harmful to the fibres. Some inks contain carbon in the form of lamp more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236628896
  • 9781236628893