Vfl vs evap

Rebecca
Hey guys, so I may have the dumbest question ever. Can evap lines appear right away? Or only after the test has dried? Reason I'm asking is bc I took a test tonight after work (dumb I know) and immediately had 2 lines but I couldn't tell if it definitely had color or not. It was a cheap dollar store purple test if that makes a difference. I don't have a pic bc by the time I thought to take one it was probably after the time limit. Thanks!