. Sessional papers of the Dominion of Canada 1901 . iderable amountsof it. Doth were straight alum powders, and gave results as follows:— Sample 19,592 (b.) 607 ammonia sulphate. 19,560 (b.) 7-52 Five other samples gave traces of ammonia. ADULTERATION OF FOOD. 73 SESSIONAL PAPER No. 14 The low percentage of sulphuric acid present in many of these powders, togetherwith the fact that recently, imported samples of burnt alum containing only traces ofalkali have come under my notice, leads me to infer that burnt sulphate of alumina istaking the place of burnt alum properly so called, This gives a
. Sessional papers of the Dominion of Canada 1901 . iderable amountsof it. Doth were straight alum powders, and gave results as follows:— Sample 19,592 (b.) 607 ammonia sulphate. 19,560 (b.) 7-52 Five other samples gave traces of ammonia. ADULTERATION OF FOOD. 73 SESSIONAL PAPER No. 14 The low percentage of sulphuric acid present in many of these powders, togetherwith the fact that recently, imported samples of burnt alum containing only traces ofalkali have come under my notice, leads me to infer that burnt sulphate of alumina istaking the place of burnt alum properly so called, This gives a higher efficiency to thearticle, and no objection holds against its use as compared with alum, provided thepure sulphate is employed by the roaster. Separation from mother-liquors as alumcrystals ensured the purity of the raw material in a way which the use of the difficultlycrystallizable sulphate of alumina can scarcely be said to do. I have the honour to be, sir, Your obedient servant, A. McGILL. 74 IX L A ND RE I rENUES. 64 VICTORIA, A. 1901. ?•*luX P?!-S ADULTERATION OF FOOD. 75 SESSIONAL PAPER No. 14
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