It was a few years ago. I can't remember the brand, but I remember I had to mix dry peat with distilled water and add the chemical. The color is turned to could then be compared to the chart.
Was it something like Bromothiol Blue?
I wouldn't worry about it. Over time the peat should break down and decay. Thus making it more acidic. Has anyone done tests to see if the pH really matters when it comes to growth?
"Every good and perfect gift is from above, coming down from the Father of the heavenly lights, who does not change like shifting shadows."
If one wanted to lower the p.h. for such an experiment; how would you go about doing it?