Measuring PH Several Days Later

[brewNYC]

Hi all,

I realized in the middle of a brew day that my PH meter was not calibrated. Since I really only check mash PH to correct for later batches, I just pulled a sample and stuck it in the fridge to check later. Plan is to let it come up to room temp and measure.

It’s been in the fridge in an open plastic cup for 4 days. Will that time in the fridge have changed the PH? I’d like to see where I stand, but I don’t want to adjust for a future recipe based on a faulty PH reading.

thanks!

 

[Silver_Is_Money]

You are sort of in unexplored territory, and if the sample begins to ferment from wild yeast or bacteria exposure (even if cold) the greatly delayed pH reading will no longer be valid. I'll go out on a limb though, and state my "opinion" that if the sample does not become wild yeast or bacteria contaminated the pH reading should still be representative.

 

[brewNYC]

unexplored territory - great way of saying “dude, WTF”. I usually average at least one of those per brew day..