EFFECT OF ALKALI TIIKATMENT ON COCOAS. 3 



DESCRIPTION OF INVESTIGATIONAL SAMPLES. 



Practically all samples analyzed in this investigation were obtained 

 directly from the manufacturer, the kind and percentage of alkali 

 employed being known in nearly every case. As far as possible, 

 samples were obtained from the same manufacturer of both treated 

 and untreated cocoas made from the same blend of beans, ascer- 

 taining where possible what beans were used in the blend. The 

 samples taken represent the products of a large majority of the 

 manufacturers of so-called "Dutch process" cocoa in this country, 

 and also four of the most popular foreign brands. In addition to 

 these, samples were taken of plain cocoas manufactured by those 

 concerns which made no "Dutch process" cocoa, for the purpose of 

 determining the constants of a plain cocoa which could by no means 

 be contaminated with a "Dutched" cocoa. Moisture and fat de- 

 terminations were made on each sample so that all other determina- 

 tions could be calculated to a moisture and fat free basis and the 

 results made comparable. Table 1 gives the number of each sample, 

 the variety of bean, the kind and percentage of alkali, and the 

 amount of moisture and fat. Moisture was determined by drying at 

 the temperature of boiling water for four hours. The fat was deter- 

 mined by extracting the sample in a Knorr extractor with anhydrous 

 ether for four hours. 



Table 1. — Description of samples. 



No. 



Blend. 



Kind and percentage of alkali. 



Moisture. 



Fat. 



Same as 1 



Accra, Bahia, Guyaquil 



Accra, Sanchez 



Guyaquil, Bahia 



do 



Sanchez, Guyaquil 



Guyaquil, Sanchez, La Guaira, 



Bahia. 

 Trinidad, La Guaira, Bahia, San 



Thome. 



Bahia, Arriba, Trinidad, Porto Ca- 

 bello, Maracaibo, Ceylon. 



Same as 11. 

 Same as 12 . 



Sanchez, Trinidad . 

 do 



Same as 22 . 



Same as 25 . 

 Bahia 



Untreated 



2.5 per cent potassium carbonate 



Steam treated 



3 per cent potassium carbonate 



2.5 per cent potassium carbonate 



0.32 per cent ammonium carbonate, 



1.65 per cent potassium bicarbonate, 

 0.15 per cent sodium bicarbonate. 



2.84 per cent sodium bicarbonate 



2 per cent potassium bicarbonate, 1 

 per cent ammonium carbonate. 



0.66| per cent potassium carbonate, 

 0.33J per cent ammonium carbo- 

 nate. 



2 per cent potassium bicarbonate, 1 

 per cent ammonium carbonate. 



2.5 per cent potassium carbonate 



...... 'do 



Untreated 



Water treated 



2.5 per cent potassium carbonate, 10 

 per cent water. 



1.5 per cent potassium carbonate, 1.5 

 per cent sodium carbonate. 



Sodium carbonate 



do 



Untreated 



2.5 per cent sodium carbonate 



2 per cent sodium carbonate 



1 per cent potassium carbonate 



Untreated 



1 per cent potassium carbonate 



Untreated 



4 per cent ammonium carbonate 



Fermentation process 



1 per cent potassium carbonate 



Per cent. 

 4.07 

 2.34 

 4.31 

 1.98 

 2.47 

 4.40 



3.73 

 3.49 



Per cent. 

 17.81 

 18.98 

 18.45 

 21.15 

 23.56 

 20.65 



20.90 

 20.23 



2.92 



25.28 



3.03 



17.90 



3.78 



16.62 



3.07 



20.12 



3.19 



25.48 



4.55 



20. 6S 



2.74 



22.37 



2.60 



21. IS 



3.62 



21.28 



2.50 



21.25 



2. SI 



23.21 



1.95 



20.68 



2. 65 



15. S9 



1.80 



18.84 



4.30 



22.71 



4. 7S 



20. IS 



3. S3 



28.35 



4.3S 



17.42 



