tungstate

Cover with dilute ammonia, and filter the solution, which contains ammonic tungstate, into an evaporating dish.

A solution of tungstate acidulated with hydrochloric acid becomes intensely blue on the addition of stannous chloride and warming.

It is covered with tungstate of calcium, instead of barium platino-cyanide.

Wolfram, wol′fram, n. a native compound of tungstate of iron and manganese.

The preparation of calcium tungstate for fluorescent screens is very simple.