CAULINE.

Globe, Volume XXI, Issue 1781, 5 November 1879, Page 3

CAULINE.

MM. Savigny and Colineau have just made an original discovery of considerable practical importance. They have succeeded in extracting from red cabbage or broccoli a colouring matter which ia absolutely inoffensive, and capable of application in all the ordinary operationa of painting, printing, and dyeing. To this they have given the name " Cauline," from the Latin Caulis, a cabbage. The leaves of the plant are cut into email puces, thrown into boiling water in the proportion of 31b of the leaf to three litres of water, and there left to moderate for twenty-four hoars ; at the end of thia time they are withdrawn and subjected to strong pressure, and the juicea thus expressed are added to the liquor of infusion. As thua obtained the " cauline " : a of a blue-violet colour, and forms the base of a series of derivatives constituting precipitate of various colours. For example, " Baracauline," obtained by introducing two grains of baryta into 600 grammes of cauline, affords a light green dye. A fine blue green, " Ohlorooalcicauline," may be obtained by mixing 100 grammes of anhydrous chloride of lime with 600 grammes of cauline; or an artificial bronze by adding 100 grammes of chloride of manganese and 6 grammes of baryta to 600 grammes of cauline, the resulting colour ing matter beirg " mango cauline." Lastly, an ultramarine blue, " zincocarbo-cauline," is obtained by mixing 40 grammes of chloride of zinc and 25 grammes of carbonate of aoda with 600 grammes of the infusion liquid.