COMPOSITION AND PrRopERTIES OF M1LK POWDERS 321 
Solubility of Milk Powders of Film-Drying Process, and 
of Spray-Drying Process. 
In Cold Water In Hot Water 
78.5° F. 210° F. 
Process of Desiccation Per Cent Per 5 Cent Per Cent as 
Solution Dissolved Solution Dissolved 
‘Total Solids 
| 
Film-process powders: | | 
Skim milk powder........... 3.94 | 69.61 4.42 | 78.09 
Cream powder .............. 3.46 | 61.13 4.53 | 80.03 
Spray-process powders: | | 
Skim milk powder (milk heated | 
to 150 degrees F. before | | 
Gesiceation): 4.< vase sruece 5.61 | 99.12 5.76 | 101.76 
Skim milk powder (milk heated | | 
to 210 degrees F. before | | 
MeSICCAtION) ao) oa edie ae 5.09 | &8.16 5.33 | 94.17 
Protein 
| | 
Film-process powders: | | 
Skim milk powder ........... 41 | 65 | 
Cream: powder waiiess eee ees 49 | 1.62 | 
Spray-process powders: | | 
Skim milk powder (milk heated | 
to 150 degrees F. before | | 
ESIC CATION) 2 Sediee ses ee aes 2.00 | 1.97 | 
Skim milk powder (milk heated | 
to 210 degrees F. before, | 
desiccation: aoc mnadecrd aes i Seae7. || 1.74 | 
The solubility tests, the results of which are recorded in the 
foregoing table, were made as follows: 
Two samples of film-process powders and two samples of spray- 
process powders were used. Twelve grams of each powder was 
added to 200 cc. of water at a temperature of 78.5 degrees F. The 
four samples were placed into a mechanical shaker and shaken for 
ten minutes. 
After shaking, 100 cc. of each lot was poured through a paper 
filter and the filtrate analyzed for percentage of total solids. 
The remaining 100 cc. of each lot was heated to the boiling 
