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#41
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Inexpensive ph meter
(Dan Quinn) wrote
I did find one film developer formula which used Vit. C only: one tsp Vit. C and two tbl. of "washing soda". Develop thirty minutes. That should read: Develop eight minutes. Other than that I don't recall any C developers which contain no other agent. Metol, hydroqinone, p-aminophenol, and you know of others which will stand on their own. At www.pofig.com I did find another formula, one from Russia. BTW, is sodium ascorbate as alkaline as sodium sulfite. How about D23-VC!! D23-VC would be the usuall D23 but with 100 grams of sodium ascorbate substituteing for the sulfite. Dan |
#42
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Inexpensive ph meter
On 19 Mar 2004 20:14:48 -0800, (Dan Quinn) wrote:
BTW, is sodium ascorbate as alkaline as sodium sulfite. How about D23-VC!! Dan Sacrilege ! Heresy ! And besides, it won't work. Regards, John S. Douglas, Photographer - http://www.darkroompro.com Please remove the "_" when replying via email |
#43
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Inexpensive ph meter
By the way, did anybody come up with an inexpensive pH meter?
_________________ Ready, Fire, AIM. Bruce Brooklyn, N.Y. |
#44
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Inexpensive ph meter
On Sat, 20 Mar 2004 11:59:49 -0500, Patrick Gainer
wrote: Have any of you measured pH of HC110B? I don't believe it is as high as you might think. MSDS states 8.8~9.0 for working strength solution. I would guess 9.0 for Dil. B. Rodinal is another one that may not be what you would think. It works fine at 1:75 or higher dilutions. I've heard Dektol does nearly as well. Regards, John S. Douglas, Photographer - http://www.darkroompro.com Please remove the "_" when replying via email |
#45
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Inexpensive ph meter
On 21 Mar 2004 03:59:39 GMT, om (Bruce) wrote:
By the way, did anybody come up with an inexpensive pH meter? Yes. http://www.technika.com/Sper/s840035.htm Regards, John S. Douglas, Photographer - http://www.darkroompro.com Please remove the "_" when replying via email |
#46
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Inexpensive ph meter
I paid $24 + postage for a brand new, in the blister Hanna checker from
K-Mac Art and Pond Supplies in Ebay. It works, and one needs also the calibration kit. Jorge om (Bruce) wrote in news:20040320225939.26960.00000134 @mb-m21.aol.com: By the way, did anybody come up with an inexpensive pH meter? _________________ Ready, Fire, AIM. Bruce Brooklyn, N.Y. |
#47
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Inexpensive ph meter
John wrote: On 19 Mar 2004 20:14:48 -0800, (Dan Quinn) wrote: BTW, is sodium ascorbate as alkaline as sodium sulfite. How about D23-VC!! Dan Sacrilege ! Heresy ! And besides, it won't work. Regards, John S. Douglas, Photographer - http://www.darkroompro.com Please remove the "_" when replying via email Sodium ascorbate is nearly neutral. 7.5 grams of metol will activate about 30 grams of sodium ascorbate. A touch of borax might cause it to set fire to your film, if that's what is meant by burnt out highlights. I would suggest leaving out the borax and using the metol-ascorbate concoction as the first bath of a 2-bath. |
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