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. 1892 Excerpt: ...the requisite mordant, sulphate of alumina, copperas, or acetate or chloride of chromium to fix it, sufficient thickening, and if there is any tendency for too much acidity, then some sodium acetate. In the case of using sulphate of alumina and copperas then some oxalic acid must be added, which acts by causing a reduction and partial solution of the colour lake in the printing colour. For the thickening any good starch-tragacanth thickening will answer; a good one can be made with 2 lbs. gum tragacanth soaked in 1 gallon of water, when well soaked 3 gallons of water are added, 10 lbs. of starch are stirred in and the whole boiled well, then 5 gallons of water are added, and the mass again boiled for one hour, when cold it is ready for use. After the printing, the pieces are dried, then steamed for two hours at a pressure of 74. to 10 lbs., after which they are soaped at 1330 F. in a soap-bath containing 46 ozs. soap in 10 gallons of water, this is repeated once or twice, then the pieces are washed and dried. When care has been taken in carrying out the details of the process the results are good, the tints obtainable are brilliant and quite fast to light, air and washing. As Alizarine colours may be classed, Alizarine, Alizarine orange, Alizarine blue, Alizarine Cyanine R and G, Alizarine Bordeaux B and G, Anthracene brown, Alizarine yellows, Anthracene yellow, Gambine yellow, Gallein, Gallocyanine, Anthracene Green, Caeruleine, and a few others. Printing Silk With Dyewood And Other Colouring Matters. In this section the application to silk printing of other colours than those derived from coal tar will be described. These bodies are far more difficult to use, and the results not so certain as the coal tar colours, and they are therefore being gradually di...