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1
Buy a pennyworth of
blue
litmus
paper from a drug store.
2
This will be indicated by the
blue
litmus
paper.
3
It is, therefore, well to test all milk with
blue
litmus
paper before feeding it to young children.
4
Repeat, using
blue
litmus
paper.
5
Test with
blue
litmus
.
6
So long as the ends of the
blue
litmus
paper become more or less reddened, the acids have not been completely saturated.
7
Several sheets of the
blue
litmus
paper should be buried in the mud, care being used that the hands are clean and dry.
blue
litmus
blue