Gerald Is that why I see no rise in activity in ID-11 if I seal it from air completely? Regards Ralph W. Lambrecht http://www.darkroomagic.com On 2005-11-28 19:04, "Koch, Gerald" <gkoch02@xxxxxxxxxx> wrote: > The problem with the rise in pH of D-76 with time is due to the > oxidation of hydroquinone. This is a fairly complex reaction in which > OH- ions are produced. It has nothing to due with either carbonates or > borax. > > -----Original Message----- > From: pure-silver-bounce@xxxxxxxxxxxxx > [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of John Black > Sent: Monday, November 28, 2005 12:51 PM > To: pure-silver@xxxxxxxxxxxxx > Subject: [pure-silver] Re: D-76 and variations > > > >> >> >> The original D-76 formula and Ilford's published formula for ID-11 >> are: >> >> Water (at 125F or 52C) 750.0 ml >> Metol 2.0 grams >> Sodium Sulfite, dessicated 100.0 grams >> Hydroquinone 5.0 grams >> Borax, granulated 2.0 grams >> Water to make 1.0 liter >> > > Seems like I remember the OLD original prewar formula for D76 was > accelerated with Na Carbonate and had a problem with increasing activity > with aging in solution that was traced to a rise in pH mediated by the > carbonate. All of which was remedied by switching to borate > accelerators/buffers. Am I dreaming or was that the case many years > ago? > > JB > > > > ======================================================================== > ===================================== > 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. > ============================================================================== > ==============================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. ============================================================================================================= 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.