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In my experience with evaps on blue dye tests, they have been super thin and they take a while! when I finally got a BFP on a blue dye after three on FRER it was super thick just like the control line! and yes the evaps were blue but they were like a different shade of blue, like super bright!â?¦With my BFP on the blue dye test is popped up in 2 mins and 20 seconds..just make sure you read those blue dye tests before 10 mins..I hope that helps a little maybe! good luck!! :)

From what i hear...if you take a picture of your test and invert it (make it a neg pic) if its a evap line it won't show up. However, if its a true positive test the + will be visible. Hope this helps. GL