I have pH-strips (scale 1-14) that I've tested a few times now.
With my CM the colour hardly changes wich would be around 6 if it works.
Urine gives the same, no change in colour, but saliva is an immediate green coulour, 7.
How do I know that the strip works on CM?
I did take a vagitorial thing the other day (pH 3,5) and have been eating cranberries and drinking sprite zero like crazy, but still, how would I know that it is correct?