Can an evap or false positive appear within the allowed 3 minute wait time and actually be a negative?

Question

I took a generic blue dye test after holding my urine for maybe like 3 hours. I waited the recommended 3 minutes and took a look. I sort of saw a line. Took a few pics and I think its there too.

Answer

I wouldn’t trust these tests AT ALL. I got this a while back and i wasn’t even pregnant. They’re HORRIBLE.

Answer

Test looks negative, but yes Blue dyes can have evaps within the time frame. It’s always best to use a pink dye.

Answer

Negative

Can an evap or false positive appear within the allowed 3 minute wait time and actually be a negative?

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