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I been working with acids and bases for quite some time now, and though this is not as precise as using a pH meter, it is a lot more accurate than the natural indicating solution of red cabbage. And if it answers your question, 7 is neutral, below seven is acidic, above 7 is basic.
(Posted on 9/28/08)
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Works great! Lemon juice is red and drain cleaner dark brown, just as the bottle paper shows. Nice indicator on this litmus. I was going to make my own but this is a time saver. Thanx for selling it! So i had this no name drain cleaner i thought was a rip off liquid, i tested a few drops left over after finishing with it. The drain cleaner pH checked out as a high base, dark brown color on the litmus, with my new Litmus paper! :)
(Posted on 9/15/08)
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It does not change colour to any chemical. It only gets the wet look.
(Posted on 7/8/08)