Marbles---my local Dollar store sells them---a decent size plastic bag of them for a buck. On 5/15/10 8:43 PM, "Richard Knoppow" <dickburk@xxxxxxxxxxxxx> wrote: > > ----- Original Message ----- > From: "Janet Cull" <janetgcull@xxxxxxxxx> > To: <pure-silver@xxxxxxxxxxxxx> > Sent: Saturday, May 15, 2010 12:28 PM > Subject: [pure-silver] Re: chips in bottom of fixer bottle > > >> It's dark brown (so I can't see really well to the bottom) >> plastic. I put hot water in and agitate it. Yes, >> they're very thin dark slivers - presumably from the >> bottom. I don't know if they were safe lying there, but >> I've broken and stirred them up - or if tiny particles of >> *that* were my trouble before. If I had a way to get a >> new one right now I would just toss that bottle and start >> over. For now I'm holding off on processing film. I >> don't want more gunk on my film. >> >> I just wanted to know if that was unusual to find, if you >> all encountered that, or how you avoided it. >> > Its hard to know exactly what it is but likely its > sulfided silver. You can try household bleach to remove it. > Let the bleach soak for a few hours and wash out with hot > water. If the bottle is such that you can't scrub the > insides with a brush try marbles or steel shot. I have no > idea where one obtains marbles these days but shot should > not be too difficult to find. > The old standby for cleaning is "chromic acid" cleaner. > This was the standard for cleaning laboratory glassware for > generations. > Kodak Tray Cleaner TC-1 > Water 1.0 liter > Potassium dichromate 90.0 grams > Sulfuric acid, concentrated 96.0 ml > > Swirl this stuff around in the bottle for a time and rinse > thoroughly with water. The cleaner can be re-used until it > no longer works. > > Another cleaner which may work better for silver sulfide > stains is the following. It can also be used on hands: > > Kodak TC-3 Tray and Hand Cleaner > Solution A > Water 1.0 liter > Potassium permanganate 2.0 grams > Sulfuric acid, concentrated 4.0 ml > > Store this solution in a stoppered bottle away from the > light. > > Solution B > Water 1.0 liter > Sodium bisulfate 30.0 grams > Sodium sulfite, desiccated 30.0 grams > > Both solutions can be used for several vessels but should be > discarded after use. > > An acid fixing solution can be used in place of Solution B > but it is important to wash thoroughly to eliminate the hypo > from the tray or hands. > > To clean trays" To remove stains due to silver, silver > sulfide, and many dyes, pour a small quantity of Solution A > into the vessel and allow to remain for a few minutes; rinse > well and then replace with a similar volume of Solution B. > Agitate so as to clear the brown stain completely, they wash > thoroughly. > > -- > Richard Knoppow > Los Angeles, CA, USA > dickburk@xxxxxxxxxxxxx > > ============================================================================== > =============================== > 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.