The Necessity of a Method of Estimating the Intrinsic Value or Essential Qualities of Coffee

✍ Scribed by Sayre, L.E.

• Publisher: Elsevier
• Year: 1915
• Weight: 379 KB
• Volume: 4
• Category: Article
• ISSN: 0898-140X
• DOI: 10.1002/jps.3080040119

✦ Synopsis

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the solution is much more dilute than the one proposed, still twenty minutes is ample time to completely oxidize the glycerin.

W e tried checking our results by means of the specific gravity method and found that it may be feasible with certain cautions. First, there seems to be a surprising lack of complete glycerin specific gravity tables, and in those we have, there is a question concerning the accuracy of the expansion factor for dilute solution. On the other hand, if concentrated glycerin solutions are used, temperature becomes very important, an error of 0.1" in reading causing an error of nearly 0.15 per cent. in the amount of glycerin. But using a solution of from 60 to 80 per cent. glycerin and being very careful in reading the temperature a reasonably accurate check may be obtained for the oxidation method.

The following results give a fair comparison of the two m,ethods, showing how they may be used as comparative methods.