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To Purify Caramel

The caramel of commerce is spirit coloring, or a soluthus far tried to give a lively yellow color to soap, sulphide of cadmium (cadmium yellow) has proved the most permanent. Age and sunlight do not affect the color, and the quantion of burnt sugar in water. (See No. 694.) tity required is exceedingly small. dis under constant stirring. The color is not dissolved in the soap, but suspended in it, and much depends upon careful mixing.

In this state it is mixed with variable quanti- 2639. Το Color Soap Yellow with ties of undecomposed sugar and certain bitter Cadmium. The cadmium yellow (see above) compounds. To render it quite pure, it should is rubbed up with oil, and added to the soap be dissolved in water, filtered, and alcohol added until it ceases to produce a precipitate.

The caramel is thus thrown down, while the impurities remain in solution. Pure caramel is a black or dark brown powder, soluble in water, to which it gives a rich sepia tint; it is insoluble in alcohol, and incapable of fermentation.