Can anyone explain evap lines to me?

Question

I know that when you take a test apart it's no longer valid, but I was wondering why sometimes when you take it apart you get a line? Just curious!!

Answer

Personally, I don’t believe that opening a test makes any difference whatsoever, as that’s pretty much all that a dip strip is... a test without a case.
Evaps happen when the test dries and a line forms where the urine has dried on the test line but it is not a positive

Answer

Urine entering where the line sits that dries causes an evaporation line where the urine dried on that line.

Can anyone explain evap lines to me?

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