Took a test yesterday Lloyds pharmacy own brand pink dye test... and got a negative but then when I checked after around 15-20 mins there was a faint line.
Today iv been to Sainsburys but only ones I could get were sainsburys blue dye ones pack of 2.
After around 8-10 mins I think there may be a faint line... but both have showed up after the recommended time scale ?? 
Any experience and can you see the lines? Or is it me?