Important: Safety Warning
This page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
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Solution of Nitrate of Baryta
Dissolve 4 grains nitrate of baryta in 80 grains water. This is used in the same manner as chloride of barium (see No. 4774) for testing sulphuric acid, with the same results. tar, and having transferred the whole to a stoppered bottle, to be well shaken, several times, for the space of 3 hours; lastly, the solution is to be filtered through muslin, and preserved in a stoppered bottle. The specific gravity of that of the Pharmacopœia is 1.035.
On the large scale, the ingredients are usually placed in a carboy, or a stone-ware bottle, which they will only or fill, and, after being corked or bunged close, agitated frequently for a day or two. A cork or bung of bees'-wax or gutta-percha should be used for the purpose, unless the vessel is a stoppered one. After repose for 2 or 3 days, the clear portion is decanted through a funnel choked with crushed glass into bottles. The last should be closely corked (preferably stop-