The double chloride is fused with nitre, the melt extracted with water and the residue fused with lead, the excess of lead being finally removed by solution in nitric acid and aqua regia.
It is rapidly oxidized on heating to a temperature of 500°-600° C., and also when fused with nitre or potassium chlorate.
In John Houghton's Collections on Husbandry and Trade, a periodical work begun in 1681, there is one of the earliest notices of turnips being eaten by sheep:" Some in Essex have their fallow after turnips, which feed their sheep in winter, by which means the turnips are scooped, and so made capable to hold dews and rain water, which, by corrupting,; _ mbibes the nitre of the air, and when the shell breaks it runs about and fertilizes.
These are washed with ammonium chloride until the filtrate is colourless, ignited, fused with caustic potash and nitre, the melt dissolved in water and nitric acid added to the solution until the colour of potassium ruthenate disappears.
The residue is then fused with caustic potash and nitre, dissolved in water, saturated with chlorine and distilled on the water-bath in a current of chlorine.
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