M. Vitalis says, that his solution of tin is prepared with two ounces of tin and a pound of aqua regia made with two parts of nitric acid at 24° Baumé, and three parts of muriatic acid at 22°.
For a rose colour, the cotton is alumed as usual, and washed from the alum. It then gets the tin mordant, and is again washed. It is now turned through the dye-bath, an operation which is repeated if necessary.
For purple a little alum is added to the Brazil bath.
1. For amaranth, the cotton is strongly galled, dried, and washed.
2. It is passed through the black cask (tonneau noir), see [Black Dye], till it has taken a strong grey shade.
3. It receives a bath of lime water.
4. Mordant of tin.
5. Dyeing in the Brazil wood bath.
6. The two last operations are repeated.