from The Century Dictionary.
- noun A salt of stannic acid.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Chem.) A salt of stannic acid.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun chemistry Any salt of
Sorry, no etymologies found.
= -- After the treatment with stannate of soda and sulphuric acid the prepared cotton is ready for dyeing.
The tin contained in the stannate is deposited on the cotton in the form of stannic oxide, or, more strictly, stannic acid.
In dyeing with this class of colours stannate of soda, acetate of lead or alum may be used as mordants.
After this treatment the cotton is ready for dyeing with any kind of acid, azo and even eosine dyes, and this is done in the same manner as is used in dyeing the eosines on a stannate mordant.
Further, owing to the decomposition of the stannate by exposure to the air, it is important that the substance should be used while fresh, and that only fresh baths should be used.
The method adopted for the production of eosine pinks and scarlets on cotton involves three operations: (1) impregnating the cloth with sodium stannate; (2) fixing oxide of tin by a bath of weak sulphuric acid; and
The precipitate is then washed and dried, whereupon it takes a green colour tinged with blue, but without the brightness or durability of the preceding stannate.
The following is, the usual method of treatment, except with goods intended for very light shades: Pass the goods through a strong decoction of sumac or other tannin solution for an hour, and afterwards for an hour or two through a weak solution of stannate of soda; wring out, dip into a dilute solution of sulphuric acid, and rinse well in water.
However that may be, in these days both names signify cobalt compounds, coeruleum being a stannate of cobalt, and cyanine a mixture of cobalt and Prussian blue.
The stannate of soda is employed in the same manner as when the eosines are used, and, therefore, does not require to be further dealt with.