Re: fixing van dyke
That type of test (potassium iodide solution) may be useful but you'll probably have to recalibrate the amt and/or concentration of the testing solution. With more dilute fixer the test becomes more sensitive if used at theh same strength of the test solution (KI). Also, you want to take a few ml's of the sample from the tray to a small test tube or vial and add predetermined amount of the test solution. You don't want to add KI to the tray solution because that may inhibit fixing. That is, you'll have to establish a new way to do the test. I don't know if this is useful... you might rather want to replace the solution frequently. On Fri, 29 Sep 2006 14:27:33 -0400, "david drake" <daviddrakephoto@sympatico.ca> said: > Hello > > This is somewhat of an aside; but, when using sodium thiosulphate > fixer, such as the Sandy's recipe listed below, can one use Hypo- > check solution such as Edwal's? I'm curious as to whether Hypo-check > is designed for only factory made ammonium thiosulphate fixers? > > david > > > On 29-Sep-06, at 10:34 AM, Sandy King wrote: > > > This is the fixing solution I use for both Vandyke and Kallitype. > > > > Concentrate Stock Solution for Fixing of Kallitypes and Vandykes > > Water, at 80ºF - 750 ml > > sodium thisulfate - 200g > > sodium carbonate - 40g > > sodium sulfite - 8g > > Water to 1000 ml > > To mix a working solution, dilute 1 Part of Stock Solution + 3 > > Parts of water. I fix with two solutions, each for two minutes. The > > last is always fresh. > > > > I have never actually tested the pH but am fairly certain it would > > be fairly alkaline. > > > > My belief is that by the time a print makes it to the fixer the > > iron compounds should have already been removed. > > > > Sandy > > > > > > > > > > > > At 8:22 AM -0400 9/29/06, Ryuji Suzuki wrote: > >> But bleaching may be greater at lower pH as well... > >> > >> Come to think of it, someone could make a neutral/weakly alkaline > >> fixer > >> that contains something that facilitates removal of iron compounds... > >> > >> > >> On Fri, 29 Sep 2006 15:17:30 +0300, "Loris Medici" > >> <mail@loris.medici.name> said: > >> > Is that a problem? I see acidic PH as plus because it will not > >> promote > >> > formation of iron hydroxides... > >> > > >> > Regards, > >> > Loris. > >> > > >> > -----Original Message----- > >> > From: Ryuji Suzuki [mailto:rs@silvergrain.org] > >> > Sent: 29 Eylül 2006 Cuma 15:03 > >> > To: alt-photo-process-l@usask.ca > >> > Subject: RE: fixing van dyke > >> > > >> > > >> > One obvious concern is that Ilford Rapid wash is probably pH of > >> about 5. > >> > > >> > ... > >> > > > > > > > david drake photography > daviddrakephoto@sympatico.ca > > >
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