Publisher's Synopsis
Excerpt from The Medical News, Vol. 50: A Weekly Medical Journal; January-June, 1887
A convenient modification of this test may be employed. The dried and pulverized cake may be gently warmed with sodium hydrate, in order to dissolve the lead chromate, without going so far as to decompose the albumen present. Either sodi sulphide or ammonium sulphide may now be added, and lead, if present, will be detected by a brownish or blackish coloration of lead sulphide. By either of these tests one one-hundredth of one per cent. Of lead chromate may be detected in the dried and pulverized cake.
Only in cakes obtained from four out of the twenty-six shops visited was any lead found. In all four of these places lead was found in the tea buns purchased, and in the bright yellow pound cakes obtained in three of these places it was also found. The tea - buns were pale yellow in color, and although special tests for chromium were not applied, it is to be taken for granted that the lead was pres ent as the chromate, inasmuch as no incentive exists for the baker to introduce lead in any other form. As the chromate it, of course, replaces the far more expensive yolks of eggs.
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