Quote:
Originally Posted by merlin666
Also keep in mind that you need 99% anhydrous reagent grade potassium carbonate for this that is available from laboratory suppliers. If you use cheap stuff from Amazon it may have impurities and be already partially hydrated, so it will not be reliable.
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FWIW, I purchased a bag of it from Amazon and the several hygrometers I calibrated all came in right at 43%.