I have used Azo and love its tonal scale, I used Peckham's Amidol found in Dignan Photographic 150 B/W Formula's on pp.31, as far as I am concerned it is an unbeatable combination. I have used the 15 watt houseplant light for exposure and it works very well. Also I use a soft natural fiber 3" paint brush with constant brushing for 3 minutes when developing. Hope this will help you.