528

DYEING AND CALICO PRINTING.

Purple Spirit for Wool and Worsted.

The following spirit is used in producing certain purples with mixtures oflogwood and the red woods :—■

Take common nitrate of tin, which should be well made and recent. Warmit gently, by setting the bowl containing it in a larger cistern or vessel of hotwater, and add as much grain-bar tin, in the rod, as it will take up. It shouldmark about 80° Tw.

So-called “Aniline Spirit,” known also as “ Nitro-muriate of Tin,”—aname which is promiscuously applied to the results of at least a hundreddifferent receipts having little in common, save that tin is dissolved in hydro-chloric acid, to which more or less nitric acid has been added.

The mordant in question serves for working aniline colours upon the cottonwarps of mixed goods, and also for certain fine browns, clarets, maroons, &c.,produced with the woods. When well made this spirit gives very full, rich.

bloomy shades,

“ Single aquafortis,” at 32 0 Tw.5 gals.

Muriatic acid, at 32° Tw.2£ „

Grain-bar tin, not feathered .12 lbs.

Mix the acids, and enter about twelve rods at once, distributing them atregular intervals around the sides of the bowl. As these dissolve make furtheradditions gradually, not letting the mixture get very hot. If the temperaturethreatens to become excessive, some of the partially dissolved bars of tin maybe withdrawn from the liquid for a time, to moderate the adtion. If properlyworked it will be of a reddish or deep amber colour. This spirit containsnearly 2 ounces tin to the lb. of acid.

The following receipts, of foreign origin, will, if carefully worked, yieldcompounds of the sesquioxide of tin.

Hellot’s Mordant.

Nitric acid (strength not given) .. ., .8 ozs.

Water .8 ,,

Sal-ammoniac. i oz.

Nitre.2 drachms

Tin, granulated . 1 oz.

Another.

Nitric acid . 1 lb.

Water . 1 ,,

Sal-ammoniac. . ij ozs.

Tin .2 „

Another.

Nitric acid, at 30° Baume . 1 lb.

Sal-ammoniac.2 ozs.

Water . 4 „

Tin. 4 „

Whenever sal-ammoniac (chloride of ammonium) is added to a mordant, acertain amount of pink salt (see below) will be formed, and the result willdiffer from that given by free hydrochloric acid or chloride of sodium inequivalent amount.