Scientific amusements . 168 CHEMISTRY. to be put upon a paper filter, and well washed by pouringover it warm water, and allowing it to run through ; awarm solution of oxalic acid should now be mixed withit, and the Prussian blue will dissolve into a bright blueink. Red ink is made by boiling chips or raspings of Brazilwood in vinegar, and adding a little alum and gum ; itkeeps well, and is of a good colour. A red ink of morebeautiful appearance, but not so durable, may be made bydissolving a few grains of carmine in two or three tea-spoonfuls of spirit of Drying rooms for hides. Ma
Scientific amusements . 168 CHEMISTRY. to be put upon a paper filter, and well washed by pouringover it warm water, and allowing it to run through ; awarm solution of oxalic acid should now be mixed withit, and the Prussian blue will dissolve into a bright blueink. Red ink is made by boiling chips or raspings of Brazilwood in vinegar, and adding a little alum and gum ; itkeeps well, and is of a good colour. A red ink of morebeautiful appearance, but not so durable, may be made bydissolving a few grains of carmine in two or three tea-spoonfuls of spirit of Drying rooms for hides. Marking ink is made by dissolving nitrate of silver inwater, and then adding some solution of ammonia, a littlegum water, and some Indian ink to colour it. Printersink is made by grinding drying oil with lamp-black. The powdered gall-nut is an excellent test for iron inwater. It will turn violet if any iron be present. Formic Acid (C H,0 J is the caustic means of defenceemployed by ants, hence the term formic. It can beartificially prepared by distilling a mixture of sugar,binoxide of manganese, and sulphuric acid. On the skinit will raise blisters. BASES. 109 Lactic Acid (CgH^Oj) is present in vegetable andanimal substances. Sour whey contains it, and thepresence of the acid in the whey accounts for its powerof removing stains from table-linen. When what is called lactic fermentation occurs, milk is said to be turned. II. Bases. The definition of a base is not easy. We have de-scribed bases as substances which, combining with acids,form salts, but the definiti
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