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Methylene Blue test is recommended by the Ministry of Health as a guide for
ascertaining the bacteriological cleanliness of ice cream. The time taken
to decolourise Methylene Blue is recorded and the samples graded as follows:-
Time taken to decolourise
Provisional Grade
Methylene Blue
1 4½ hours or more
2 2½ hours or more
3 ½ to 2 hours
4 Less than 1½ hour
The 25 samples were placed in the following grades:-
2 were within Grade 1
10 were within Grade 2
5 were within Grade 3
8 were within Grade 4

Milk Supplies
There are two milk processing depots in the Borough (each with its own
private railways sidings), which receive milk daily from the country in
tankers. Milk is collected from the farms and bulked at creamery centres
in the dairying areas and after preliminary tests it is despatched to the
processing depots.
As mentioned last year, one of the depots went over to the production
of milk products, notably yogurt, and this aspect of production was
intensified during the year. In the latter part of the year rationlisation
of the Company resulted in a decision to convert to the production of cream,
part of the depot used in connection with milk products. This alteration was
B.27