Richard, While I thank you for the correction, I'm sorry you did. Now I may have to review my formula which if I recall correctly is 90 grams of borax and 36 grams of lye to make a liter of stock metaborate for my pyro. Being slightly CDO (that OCD for the unwashed, but to be truly OCD one needs to put the letters in alphabetical order as god intended!) I will have to recalibrate my times for development. ugh. Cheers, Robert Hall www.RobertHall.com Richard mentioned... The first proportions were not quite correct and were corrected by Ryuji Suzuki, I think