Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Enfield]
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TABLE 36
FOOD AND DRUGS Bacteriological Examination of Ice-Cream
Methylene Blue Test
Vendor | Type of Ice Cream | Results | |||
---|---|---|---|---|---|
Grade | |||||
1 | 2 | 3 | 4 | ||
Shop Premises | Loose or Soft | 14 | 15 | 8 | 5 |
Mobile Traders | Loose or Soft | 7 | 2 | 2 | 2 |
TABLE 37
FOOD AND DRUGS Bacteriological Examination of Milk
1. Methylene Blue Test (for keeping quality)
Designation | Number of Samples | Results | ||
---|---|---|---|---|
Satisfactory | Void | Unsatisfactory | ||
Pasteurised | 198 | 176 (88.9%) | 14 (7.1%) | 8 (4%) |
2. Phosphatase Test (for efficiency of pasteurisation) | ||||
Designation | Number of Samples | Results | ||
Satisfactory | Void | Unsatisfactory | ||
Pasteurised | 198 | 189 (95.5%) | 9 (4.5%) | — |
3. Turbidity Test (for efficiency of sterilisation) | ||||
Designation | Number of Samples | Results | ||
Satisfactory | Void | Unsatisfactory | ||
Sterilised | 52 | 52 (100%) | — | — |
4. Colony Count (for efficiency of treatment) | ||||
Designation | Number of Samples | Results | ||
Satisfactory | Void | Unsatisfactory | ||
Ultra Heat Treated | 9 | 9 (100%) | — | — |