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To Dye Ivory Blue

Steep it in a weak solution of sulphate of indigo which has been nearly neutralized with salt of tartar; or in a solution of Prussian blue. A still better plan is to steep in the dyer's green indigo vat; or, insert the ivory for 15 to 20 minutes in diluted muriatic acid (+ ounce of acid for 1 pound of water, having the taste of a good vinegar), and from this acidulated water transfer the ivory into a more or less concentrated solution of indigo-carmine (soluble indigo), and keep it in that solution until the ivory has assumed a uniform blue color; then dry and polish.