I had this faint line and I’ve been told clear blue isn’t great (fair enough!) I think it’s an evaporation line, but I read they should be colourless. Someone said to open the test up and when I did and looked on the back, the line seen in the picture is blue and next to it is a full colourless thin line. Is that the evap line? Can there be two evap lines? I took a pink dye one and it was super thin I had to squint