Note 170 — Part IV. Examination and Analysis of Cacao Preparations.
Reading edition
cf. also Farnsteiner Z.U.N. & G. XVI 1908, p. 642 yet according to information from Dr. Böhme from the laboratory of Stollwerk Bros, bluing from red or violet litmus paper should also take place in the case of cacao prepared with potash, and on the contrary the Kurkuma brown not result.