18 



Twenty-first Convention, 1904, Bui. 90, Cir. 20. 



The Amthor test for caramel as modified for distilled liquors by 

 Lasche was adopted as provisional. 



DETECTION OF CARAMEL (AMTHOR METHOD MODIFIED BY LASCHE). 



Add 10 cc of paraldehyde to 5 cc of the sample contained in a test tube and 

 shake. Then add absolute alcohol, a few drops at a time, shaking after each addi- 

 tion until the mixture becomes clear. Allow to stand. Turbidity (after ten minutes) 

 is indication of caramel. The Brewer Distiller, May, 1903. 



Twenty-second Convention, 1905, Bui. 99, Cir. 26. 



On page 97, substitute the following method for the determination 

 of aldehydes for the method given under heading "8": 



Determine the aldehydes in the distillate prepared for the esters. Five to 10 cc 

 of the distillate are diluted to 50 cc with aldehyde-free alcohol (50 per cent by vol- 

 ume), 25 cc of the reagent added, and allowed to stand for 20 minutes at 15 C. The 

 solutions and the reagents should be at 15 C. before they are mixed. 



Reagent. Dissolve 0.5 gram of pure fuchsin in 500 cc of water, then add a water 

 solution of sulphur dioxid, equivalent to 5 grams of sulphur dioxid, and make the 

 whole up to 1 liter. This solution can be used as soon as it becomes colorless and 

 will keep for several days. 



Aldehyde-free alcohol is prepared by treating ordinary 95 per cent alcohol with 

 potassium hydroxid and distilling. Then this distillate is treated with about 3 grams 

 to the liter of metaphenelenediamin hydrochlorate, and heated with a reflux con- 

 . denser for several hours, then distilled slowly, not keeping the first 100 cc nor the last 

 100 cc. This will give an alcohol which will give only the slightest tinge of color 

 when treated with the reagent. 



The standard aldehyde solution is treated in the same way as the distillate, and 

 the color of the standard must be very close to the color of the sample. 



On page 98 substitute the following method for the one given under 

 "9. Determination of Ethereal Salts" (see change adopted in 1903): 



9. DETERMINATION OF ETHEREAL SALTS. 



In 50 cc of the distillate neutralize the free acid with decinormal alkali, using phe- 

 nolphthalein as an indicator, then add 25 cc decinormal alkali and either heat for 

 one hour with a reflux condenser, cool and titrate with decinormal acid, or allow 

 the solution to stand over night in a stoppered flask with the excess of alkali, then 

 heat with a tube condenser for one-half hour below the boiling point, cool and titrate. 

 The number of cubic centimeters of decinormal alkali used in the saponification of 

 the esters is calculated as ethyl acetate. One cubic centimeter of decinormal alkali 

 equals 0.0088 gram ethyl acetate. 



The distillate for esters, aldehydes, and furfural is prepared in the following man- 

 ner: Add 25 cc of water to 200 cc of the whisky and distill until 200 cc are distilled 

 off. It is advisable to use a mercury valve in order to prevent loss of alcohol, and 

 the distillation should be made slowly. 



[Note by the Editor. In this method the words in italics indicate 

 slight changes and an addition made subsequent to the action of the 

 association, by Mr. Tolman, who submitted the method.] 



