IMPROVEMENT IN RREPARING CITRIC ACID. Citric acid of which the consumption in this country is now very large is imported chiefly from Sicily and usually reaches this country as a black fluid in appearance closely resembling a thin treacle. This black fluid is obtained by inspissating the juice procured by subjecting lemons to pressure after the rinds of the lemons have been removed for the sake of their essential oil. The first process to which this black juice is subjected by the manufacturers here is that of treatment with chalk whereby an insoluble citrate of lime is obtained. This citrate of lime after having been well washed with cold water is decomposed by sulphuric acid insoluble sulphate of lime being thus foamed and citric acid passing into solution. At this stage the citric acid is still as sociated with a considerable quantity ot coloring matter of which citric acid is perhaps more tena cious than any other vegetable acid and accordingly the next step is to remove as much of this as pos sible by matins of animal charcoal. The solution is then evaporated until on cooling it will crystallize. The crystals it then yields are by no means free from coloring matter but are of a decided brown color and are therefore re-dissolved and their solution treated again with animal charcoal evaporation and crystallization being then repeated as before. Such is the process by which citric acid Is usually manu factured; but M. Ferret as has already been an nounced in these columns is laying to introduce a process the first stage of which would be the com bination of the citric acid in the lemon juice with account of M. Ferret's proposals the main object of occurs by reason of the inspissated lemon juice be coming so alterated during its transit from Sicily to England as to be completely spoilt. This liability of the inspissated juice to spontaneous alteration is shared by citrate of lime and hence no advantage has been found to attend V e plan which has been many times tri
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