A last last(!) ;) remark: - You may use a 2% citric acid first wash instead of tap water... 05.08.2010 23:08, Loris Medici yazmış: > A last remark (just noticed the technical part of the very last part > of your entry): > > - FWIW, my exposure time with a bank of 40W UVBL bulbs was something > around 6:30...