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#11
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Borax vs 20 Mules
Patrick, with your Formula B / Phenidone from the Unblinking Eye article, do
you remember what your normal developing time was/is for TMX? I'm at 7:30' and getting negs that look to be close to a stop over, yet if I soup them in D76 I get get negs that are pretty much on the button... My pattern is constant inversions for the first ten seconds, then one inversion every ten seconds for the remainder of first minute, then 4 inversions over a ten second period, at minute intervals until done... denny "Patrick Gainer" wrote in message ... |
#12
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Borax vs 20 Mules
Patrick Gainer wrote
You say they look overexposed compared to D-76? That is how they should look. Sulfite-free developers often give more film speed. He's comparing a phenidone developer with a M/Q. You don't think it is the phenidone giving that higher density? "Sulfite-free developers often..." That's a little tricky. Might not that be due to being also "often" free of metol and hydroquinone? Dan |
#13
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Borax vs 20 Mules
Dan Quinn wrote: Patrick Gainer wrote You say they look overexposed compared to D-76? That is how they should look. Sulfite-free developers often give more film speed. He's comparing a phenidone developer with a M/Q. You don't think it is the phenidone giving that higher density? "Sulfite-free developers often..." That's a little tricky. Might not that be due to being also "often" free of metol and hydroquinone? Dan It could be. It is possible to use 10 times more metol than pheindone in the same formula. It has been a long time since I did so. I remember remarking at the time that the MC developer was about as active as D-76. Look at Unblinkingeye.com and see if I showed the H&D curves for both. |
#14
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Borax vs 20 Mules
Patrick Gainer wrote: Dan Quinn wrote: Patrick Gainer wrote You say they look overexposed compared to D-76? That is how they should look. Sulfite-free developers often give more film speed. He's comparing a phenidone developer with a M/Q. You don't think it is the phenidone giving that higher density? "Sulfite-free developers often..." That's a little tricky. Might not that be due to being also "often" free of metol and hydroquinone? Dan It could be. It is possible to use 10 times more metol than pheindone in the same formula. It has been a long time since I did so. I remember remarking at the time that the MC developer was about as active as D-76. Look at Unblinkingeye.com and see if I showed the H&D curves for both. I looked. I did not make the comparison between the metol and phenidone versions. I guess I will have to. |
#15
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Borax vs 20 Mules
Dan Quinn wrote: Patrick Gainer wrote You say they look overexposed compared to D-76? That is how they should look. Sulfite-free developers often give more film speed. He's comparing a phenidone developer with a M/Q. You don't think it is the phenidone giving that higher density? "Sulfite-free developers often..." That's a little tricky. Might not that be due to being also "often" free of metol and hydroquinone? Dan I just finished the test. I used a step density wedge. Developed two strips of HP5+, one in metol-C-carbonate and the other in phenidone-C-carbonate, each for 8 minutes at 70 F. When I plot the curves, the only real difference is in base+fog which is 0.29 for metol, 0.38 for phenidone. The curves are otherwise parallel all the way up. Surprised me too. The formula: 1 tsp pHPlus (sodium carbonate) 1/2 teaspoon ascorbic acid 0.2 grams (3.5 grains) metol or 2 ml of 1% phenidone in propylene glycol. |
#16
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Borax vs 20 Mules
Partick
Do you think some benzotriazole would be advisable with phenidone? Thanks, Jorge Patrick Gainer wrote in : I just finished the test. I used a step density wedge. Developed two strips of HP5+, one in metol-C-carbonate and the other in phenidone-C-carbonate, each for 8 minutes at 70 F. When I plot the curves, the only real difference is in base+fog which is 0.29 for metol, 0.38 for phenidone. The curves are otherwise parallel all the way up. Surprised me too. The formula: 1 tsp pHPlus (sodium carbonate) 1/2 teaspoon ascorbic acid 0.2 grams (3.5 grains) metol or 2 ml of 1% phenidone in propylene glycol. |
#17
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Borax vs 20 Mules
Jorge Omar wrote: Partick Do you think some benzotriazole would be advisable with phenidone? Thanks, Jorge Patrick Gainer wrote in : I just finished the test. I used a step density wedge. Developed two strips of HP5+, one in metol-C-carbonate and the other in phenidone-C-carbonate, each for 8 minutes at 70 F. When I plot the curves, the only real difference is in base+fog which is 0.29 for metol, 0.38 for phenidone. The curves are otherwise parallel all the way up. Surprised me too. The formula: 1 tsp pHPlus (sodium carbonate) 1/2 teaspoon ascorbic acid 0.2 grams (3.5 grains) metol or 2 ml of 1% phenidone in propylene glycol. Not worth the trouble or expense. You can make this developer for leaa than 50 cents a gallon. That much difference in density won't affect the grain noticeably. |
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