This invention is comprised in a small compass. The Patentees say, according to the ordinary processes of dyeing browns, greens, olives, Saxon blucs, and blacks, a substance called "argal" (crude tartar) is employed as a mordant, as is well understood by dyers, which is an expensive material. Now, the object of this invention is to employ sulphate of soda as a mordant in the process of dyeing, in place of argal, by which the process of dyeing will be materially improved, both as to the cost and in other particulars.
The sulphate of soda is to be ground and sifted, in order to obtain it in the state of fine powder, similar to the condition in which argal is prepared for the dyer; and the subsequent treatment of sulphate of soda ist similar to that pursued in preparing and employing argal as a mordant; and a dyer, acquainted with the ordinary process of using argal will, by substituting sulphate of soda, find the working of this invention easily to be performed; and he will find, that in many respects, the colours will be produced more readily than when argal is used, and hence the time occupied in the dyeing of some colours be shortened.
It should be remarked, that the sulphate of soda obtained from the nitrate of soda, is that which is most generally effective for the various colours above mentioned; but the sulphate of soda obtained from common salt (muriate of soda), though less valuable, as requiring more observation and care of the dyer, may be advantageously employed for a mordant in dyeing heavy colours, particularly browns and greens.
The Patentees add, by way of conclusion, "Having thus explained the nature of our invention, and the manner in which the same is to be performed, what we claim as our invention, is the using of sulphate of soda in the process of dyeing, as above described."
— [Inrolled in the Inrolment Office, October, 1837.]
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