Username Post: I may have a strange question but...
Posts: 4072
Joined: 01-10-10

    In response to AndieBee

I just tested one with my pH tester pen, and the line is still purple (it would change to yellow if the tested item were acidic). So in this case - I don't know the brand of the paper towel, sorry - it's acid-free, but not necessarily lignin-free, which is also important.

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