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Search: Posts Made By: Stocky
Forum: Manufactured brews 9th August 2022, 10:34 AM
Replies: 5
Views: 242
Posted By Stocky
The only time I used a stock solution of...

The only time I used a stock solution of phenidone I was similarly disappointed. I had used alcohol, food grade which contained a small percentage of water which allowed the phenidone to deteriorate...
Forum: Chemical formulae 8th August 2022, 10:34 PM
Replies: 10
Views: 3,322
Posted By Stocky
Ascorbic acid deteriorates faster if it's exposed...

Ascorbic acid deteriorates faster if it's exposed frequently to atmospheric humidity. Sodium ascorbate less so, but obviously it's not suitable for many formulations.
Forum: Darkroom 8th August 2022, 10:31 PM
Replies: 15
Views: 287
Posted By Stocky
I use a 12x16 Nova (the more common vertical...

I use a 12x16 Nova (the more common vertical model). I have found that the ripple texture of the plastic side can leave a trace in the print which in my case appeared only after toning (2 bath...
Forum: Chemical formulae 26th July 2022, 09:24 PM
Replies: 8
Views: 259
Posted By Stocky
Now that I think about it, my reservations about...

Now that I think about it, my reservations about getting the combination exactly right, because of the strength of sodium hydroxide, for fixer it would be inconsequential, as the pH could vary a bit...
Forum: Monochrome Film 25th July 2022, 07:05 AM
Replies: 15
Views: 460
Posted By Stocky
Am I correct to assume that that warning would be...

Am I correct to assume that that warning would be for a specified amount of diluted developer? I would hazard a guess that in that sort of case, the desired density of the negative would be a...
Forum: Chemical formulae 25th July 2022, 05:33 AM
Replies: 8
Views: 259
Posted By Stocky
The limiting factor would appear at first to be...

The limiting factor would appear at first to be the solubility of borax. A search will offer various amounts, and warmer temperatures will allow more to dissolve. Sodium hydroxide is very soluble...
Forum: Monochrome Film 25th July 2022, 12:32 AM
Replies: 15
Views: 460
Posted By Stocky
There's a difference between optimum and what one...

There's a difference between optimum and what one can get away with. I suspect that much of the advice on the internet has not been tested for being optimum. One way to test would be to develop a...
Forum: Chemical formulae 15th July 2022, 11:19 PM
Replies: 3
Views: 168
Posted By Stocky
Thanks Ian and Bill. At least that gives me...

Thanks Ian and Bill.

At least that gives me some confidence that I'm on the right track.
Forum: Chemical formulae 13th July 2022, 10:09 PM
Replies: 3
Views: 168
Posted By Stocky
Pyrocat Part B maybe a bit weak?

I have used Pyrocat-HD successfully for some years. After doing not much photography for a couple of years, I have had to do some testing of a film new to me, HP5+, as my old favourite Neopan400 is...
Forum: Photography in general 12th July 2022, 01:27 AM
Replies: 10
Views: 363
Posted By Stocky
Can the enlarger be focused manually? Is...

Can the enlarger be focused manually? Is everything tight, so no creeping?
Forum: Darkroom 23rd June 2022, 12:21 PM
Replies: 13
Views: 437
Posted By Stocky
So to some degree it's self correcting, loss of...

So to some degree it's self correcting, loss of density towards the edge of the negative compensated by the falloff of the enlarging lens (as long as one isn't extreme, like a very wide taking lens.
Forum: Darkroom 22nd June 2022, 10:13 PM
Replies: 13
Views: 437
Posted By Stocky
and at least theoretically speaking, the longer...

and at least theoretically speaking, the longer lens will have less light falloff at the frame edge, meaning more uniform illumination and less edge burning.
Forum: Darkroom 21st June 2022, 10:14 PM
Replies: 13
Views: 437
Posted By Stocky
I remember reading that there was a Nikkor...

I remember reading that there was a Nikkor enlarging lens of stupendous quality that is rare and commands prices in multi 1000s.
Forum: Darkroom 21st May 2022, 09:54 PM
Replies: 100
Views: 3,270
Posted By Stocky
You would think so. But I have read from time to...

You would think so. But I have read from time to time that the initial minute or so of development is very important for uniformity.
Forum: Darkroom 17th May 2022, 12:32 PM
Replies: 100
Views: 3,270
Posted By Stocky
Have a look at this. Similar problem, same...

Have a look at this. Similar problem, same developer.

https://www.photo.net/discuss/threads/overexposed-lines-on-negative.5528144/
Forum: Darkroom 17th May 2022, 12:17 PM
Replies: 100
Views: 3,270
Posted By Stocky
This seems feasible to me. The first minute of...

This seems feasible to me. The first minute of development is apparently critical to uniformity.

About the only variation you haven't tried is a different developer.
Forum: Photography in general 13th May 2022, 10:57 PM
Replies: 7
Views: 486
Posted By Stocky
For fibre based paper, an acid stop bath can be...

For fibre based paper, an acid stop bath can be useful in avoiding staining.

There have been alkaline fixers available mainly in the USA, but a fixer to be optimum doesn't need to be...
Forum: Darkroom 10th May 2022, 10:56 PM
Replies: 11
Views: 624
Posted By Stocky
Is there a chance that the Paterson 35 is a...

Is there a chance that the Paterson 35 is a rebranded enlarger from another manufacturer?
Forum: Photography in general 8th May 2022, 10:22 AM
Replies: 7
Views: 486
Posted By Stocky
Alkaline or neutral fixer lasts well. Acid...

Alkaline or neutral fixer lasts well. Acid fixers are subject to breakdown as evidenced by white or yellow precipitate of sulphur.

Agfa FX-Universal (pH around 7) from 2005 is still pristine.
Forum: Photography in general 4th March 2022, 07:40 AM
Replies: 35
Views: 1,789
Posted By Stocky
Agfa BEH-1. Very contrasty single weight paper...

Agfa BEH-1. Very contrasty single weight paper (BEH= Brovira Extra Hard). There's nothing like it today.
Forum: Photography in general 21st February 2022, 11:17 AM
Replies: 40
Views: 1,431
Posted By Stocky
Uwe's quote compares constant agitation with...

Uwe's quote compares constant agitation with quite frequent agitation. Those of us looking for adjacency effects use far, far less agitation.
Forum: Equipment miscellaneous 18th February 2022, 09:06 PM
Replies: 6
Views: 453
Posted By Stocky
Is it a power pack that was made to take alkaline...

Is it a power pack that was made to take alkaline batteries if required? If so the voltage would be ok, as the alkalines are over 1.5V per cell.

You can still get NiCd, including some that are of...
Forum: Camera Accessories Manuals 25th January 2022, 01:16 AM
Replies: 13
Views: 1,215
Posted By Stocky
I have a couple of the Zone VI ones, one in 4x5...

I have a couple of the Zone VI ones, one in 4x5 proportions, and one in 35 proportions (24x36). They de-emphasise colour, so could be useful, maybe. But most of us are self trained to see the...
Forum: Monochrome Film 10th January 2022, 09:31 PM
Replies: 18
Views: 2,606
Posted By Stocky
I used the original amount of phenidone and got...

I used the original amount of phenidone and got very poor shadow density, about 2 stops under normal. The one part mixing appealed to me. Maybe the higher amount of phenidone would solve the...
Forum: Chemical formulae 3rd December 2021, 09:18 PM
Replies: 10
Views: 4,431
Posted By Stocky
I noticed on Ian Grant's web site several Kodak...

I noticed on Ian Grant's web site several Kodak variants with only a little borax and quite a lot of boric acid, including this one (above). I wondered why the pH wouldn't be too low for normal...
Showing results 1 to 25 of 242

 
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