Three oxidation two antimony plus barite powder can do
Dissolved with concentrated hydrochloric acid, can be dissolved completely transparent, and no bubbles, if there is light there will be a gas release, with barite, silica, titanium dioxide, mica powder, barium sulfate, kaolin, talc, white cement and other solution was cloudy white opaque.
If you add calcium oxide, calcium hydroxide, Magnesium Oxide and so on, use water to disperse, use PH test paper to measure acid, alkaline, alkaline is to have impurity.
The other is to sulfate, hydrochloride powder dispersed by barium nitrate, silver nitrate detection of water after clarification in the solution without a lot of precipitation (small or some).
