How to measure food acidity
I am asking about a method or a trick to measure (or guess) how acidic is food. Please don't suggest any expensive tool; this will be for home usage only.
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Use a calibrated pH meter, or paper pH test strips, to measure pH. The pH meter must be calibrated using a 2-point calibration with pH 4.0 and 7.0 buffers. The pH meter must be calibrated each day that you use it. A pH meter must be used to monitor the pH of foods with an equilibrium pH greater than 4.0.More answers regarding how to measure food acidity
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Some less precise methods using common ingredients:
Anthocyanin-containing foods (red cabbage, blueberries...) tend to turn blue in an alkaline, red in an acidic environment. Turmeric goes more lemon-yellow in acidic, more orange in very alkaline environments.
Baking soda can indicate strong acidity, it will activate and foam.
If there are green vegetables in a dish, their cooked colour gives you a hint about the cooking liquid (effect is not instant!)- if their color tends to go in the direction of olive drab, you are quite acidic; if they are unnaturally green your cooking liquid is rather alkaline.
Also, browning behaviour, especially of protein rich foods, gives you a hint - if it is hard to brown, your marinade might be just too acidic.
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