Sorry, I meant bisulphite, it was a Freudian slip, I was thinking of my hangover. On 26/6/05 11:15 am, "wjjk" <wjjk@xxxxxx> wrote: > Bisulphate will not act as a stopbath, 10% bisulphite (or sulfite) will. > > Walter > > Christopher Woodhouse wrote: >> Until recently I have always used odorless sepia toners, normally >> indirectly, following a short bleach. Having seen some prints of Ralph's I >> thought I would try Viradon 'new' for the first time and was amazed at how >> it reacted in the wash. I know all that stuff about using a Bisulphate stop >> bath, but what I was wondering is it goes against everything I thought I >> knew about chemistry. I always thought that chemical activity goes down with >> lowered concentration. Watching through the side of my archival washer, the >> print continues to get browner and browner, changing even after 20 minutes >> gentle washing. >> >> I'm intrigued, what is the mechanism that allows it to continually change >> colour when the concentration must be extremely dilute? I thought for a >> laugh I would put another print into extremely dilute Viradon - nothing >> seems to happen. What am I missing? (polite responses only!) >> > > ============================================================================== > =============================== > 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. > -- Regards Chris Woodhouse ============================================================================================================= 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.