Thanks Sezjm
I am using lullaby conceptions (Ovunow) brand - but did not get a info sheet with them. Tonight after 10mins the second line was about 50% the darkness of the control. That is the darkest I have ever had so hoping that is a good sign.

Thanks Cellsie - I will check after 5mins tomorrow and see what happens. I am still trying to work them out and i have been using them for a while now.
ANnyway thanks for your help.