�y��vlog

Many are readily soluble in water, the chief exceptions being silver chloride, mer�urous chloride, cuprous chloride and palladious chloride which are insoluble in water, and thallous chloride and lead chloride which are only slightly soluble in cold water, but are readily soluble in hot water.

On allowing the liquid to stand for some time a bright yellow precipitate of thallous iodide separates out.

The precipitate is thallous iodide TlI, and contains 61.6 per cent. of thallium.

The author prepares the thallium paper a few days before use, by dipping strips of Swedish filtering paper in a solution of thallous hydrate, and drying.