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SALDAU. Die Chokolade-Fabrikation, 1881. 



SAMELSON. Adulteration of cocoa powder. Chem. Ztg., 1888, 44, 722. 

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ZIPPERER. Untersuch. ii. Cacao u. dessen Praparate, 1887. 

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BIBLIOGRAPHY OF METHODS FOB THE ESTIMATION OF TANNIN. 



,ALLEN, A. H. Nearly all the methods worthy of detailed description are based on 

 the precipitation of tannin by gelatin or its absorption by a gelatinous sub- 



