Blue dye tests...

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Until I started using this app, I had no idea that blue dye tests were frowned upon so much.
I went to get another test today, and there weren't any pink dye ones. Maybe it's pregnancy season, or they are slacking on stocking the shelves. Anyways, I got a blue dye test.
My question is: has anyone gotten a positive with a BLUE dye test and had it be a definite positive?