What is the difference between faint positive and evaporation line?

[casey19]

Hi wondering if someone could help me. I took 2 clearly blue early detection tests 2 days ago both came back positive after about 10/15 minutes! Then next day I bought cheap Tesco digital and strip tests all 4 negative! So tonight I bought 2 more clear blue early detection test came back positive after 20/30 minutes I know that's longer than the tests says to wait but I just had a feeling that they are positive!! I got my friend to pee on one and no lines at all not even after 2 hours so that's what's making me think that they weren't evaporation lines??

A true positive will show up within the time frame. After that the urine can show the dye as it dries and look like a positive. Try a pink dye test like first response, they’re more sensitive and don’t tend to show evap lines quite so much

@casey19 if the positive line isn't there within the first full five mins, then anything later is an evaporation line. X