Hello Gerald, and all who responded. Thanks a lot for the replies. So, "bisulfite lye" it is - OK. Now I know what it is, but am still at a loss about my original second question. I need 8 grams of sodium bisulfite for 4 liters of water. How much is that in terms of 37% bisulfite lye? TIA Fyodor. Friday, March 11, 2005, 3:05:37 PM, you wrote: KG> BTW, 37% bisulfite solution is what was called "bisulfite lye" and you KG> see it mentioned in photographic formulas from around the turn of the KG> last century. ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.