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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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up vote 10 down vote accepted

Litmus paper is quite inexpensive. Edmund Scientific has 100 strips for US$1.95.

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Where can I find this? On supermarkets? –  mmonem Sep 11 '10 at 20:27
    
@mmonem: online, or wherever you might buy chemistry supplies. –  hobodave Sep 12 '10 at 2:39
    
Does it harm the food or I have to use it on a sample of the food? –  mmonem Sep 12 '10 at 9:29
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@mmonem: My wife, a chemist, doesn't think there should be any problem putting it directly into the food. They require very small samples, so using it on a sample of a food should work as well. Dipping a spoon in, and rubbing the paper across the back of the spoon should be fine. The only problem I could see is if you food has a deep color (tomato sauce, blackberries, etc). It might be hard to tell the color of the strip through the food coloring. –  KeithB Sep 12 '10 at 13:51
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@mmonem: If you're in the US, you can order them at the link I gave. Otherwise just search in Google Shopping for litmus paper. Here is a page which gives instructions more making pH test paper of various types yourself. –  Dennis Williamson Sep 12 '10 at 21:41
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