Thanks to all who responded to my query. I ended up doing the following and am pleased with the results.(posted 8631 days ago)I used Xtol made according to the package directions to make 1 litre and processed two rolls for about 6 to 6.5 minutes (I am not 100% sure of the time as I forget to start the timer and spent some time fiddling around with it after I poured in the chemicals) - I was aiming for 5.5 minutes. The second two rolls i processed for 8 minutes with the Xtol diluted 1:1. All four rolls have good contrast. Thanks again for your input.