Can anyone tell me the pH of apple skin?

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Can anyone tell me the pH of apple skin?

I need to know the pH of apple skin (not the flesh) and I cannot seem to find it anywhere. If you know it or can direct me to where I can learn more that would be appreciated. Thanks!

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The pH of the apple skin is not a constant value but a range which may vary due to several factors. It will be within a range from 3.7 to 4.7 indicating weak acidity .

This old paper gives the range in page 4 and my advice is to see the whole paper page by page:

Article Cation, Organic Acid, and pH Relationships in Peel Tissue of...