Want to Buy WTB: Haist "Modern Photographic Processing" vol 1 & 2

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Rafal Lukawiecki
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Thank you, Michael. I'll see if anyone wants to sell their used copy, first, as I would like to save a bit on the price if I can. Out of interest, is the book a bit limited when it comes to neutral rapid fixers, or the role of sodium sulfite in that context?
 
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Rafal Lukawiecki
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Michael, this is exactly my sentiment, but you are a good few steps ahead of me, having looked into this already. I am grateful you are willing to share your knowledge, thank you for that. As you may have noticed from some of my recent threads, there is a lot of "feeling" in the community, but near-zero actual fact-based, first-hand knowledge of what the chemistry may be. While I am surprised to find that state of affairs, I should not be, considering what you just wrote.

I suppose I have a bit of energy, and some drive, to get a few neutral fixer experiments done, and that is why I am stocking up on wisdom, first, as much as I can. I'll report how things work out. Unfortunately, whatever I come up with, will just work for me, my water, my paper, my process... I have no chemical engineering skills to generalise any of my minor discoveries.

Sepia Hawk, thank you for the suggestion about the pricing site.
 
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Rafal Lukawiecki
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I was thinking of PE, but he may be in a rather difficult situation, if he has, indeed, designed TF-5. He might want to keep his discoveries to himself, so as not to jeopardise the commercial success of TF-5, even if it seems, from his numerous, knowledgeable, and always very helpful posts, that he genuinely likes to share his wisdom. I just hope that this knowledge is not lost, for the future. It amazes me how much we used to know that we no longer do. When I met Neil Armstrong a few years ago, he remarked that he was sorry that we have already lost the knowledge, and the skill, how to get to the moon, even though this has been achieved numerous times a few decades ago. I realise that photochemistry is not in the same rank of importance, or difficulty, but it is a pity to lose valuable knowledge nonetheless.
 

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It seems to me by the time we all got really interested in these things, photochemistry research at Kodak etc had already essentially come to a halt.

I guess it depends on when one got interested. B&W research may have largely ended a long time ago, but color went on much longer.

The C-41 process was developed about the mid-1970s, I think. It's fixer was near-neutral pH, running about 6.5. When the RA-4 process came out, 6-hour mini-labs were close behind, followed in a year or two by 1-hour systems. Somewhere around 1980 effluent regulations in the US meant that finishers had to get good control over things. Kodak supplied a good deal of published research information on process and treatment methods, which was then used by specialist companies who built equipment such as ion-exchange systems used in developer regeneration and silver recovery from wash water. And in fact, Kodak had it's own Environmental Services group, which also worked with the photofinishing industry on these things.

I think the main thing, from the hobbyist perspective, is that no significant books on these things (as far as I know) were published after Haist. And there is probably not much further market for such books.

ps; in the other thread, I suggested a replenished fixer, which would really be the only sensible way to handle things commercially, where effluents are regulated.
 
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Rafal Lukawiecki
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ps; in the other thread, I suggested a replenished fixer, which would really be the only sensible way to handle things commercially, where effluents are regulated.

Mr Bill, I am thankful for you pointing out the fixer replenishment aspects. My research, so far, however, shows that unless one replaces a considerable volume of the used fixer, replenishment only works in conjunction with a de-silvering process in place, such as can be done in automated processors. If you are, however, of the opposite opinion, that is you have experience of replenishers which can be added without de-silvering the fixer, or without having to remove a significant portion of it, I would like to learn more. Perhaps it would be better to post back on those (there was a url link here which no longer exists) (there was a url link here which no longer exists), or maybe start a new one, so as to make others aware of our discussion, but I am eager to learn no matter how you would like to share your experience and knowledge. Many thanks, either way.
 

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My research, so far, however, shows that unless one replaces a considerable volume of the used fixer, replenishment only works in conjunction with a de-silvering process in place, such as can be done in automated processors. If you are, however, of the opposite opinion, that is you have experience of replenishers which can be added without de-silvering the fixer, or without having to remove a significant portion of it, I would like to learn more.


Well, let me see if I can work out a simplified explanation of a replenishment system. It may not be as straightforward as you would probably hope, but I'll see if I can make something brief and understandable. (Brief might be a couple of pages.)

I'll post here where it'll be (or if I decide to give up on it).
 

Mr Bill

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Ok, I've written up a couple posts on the topic of replenishing fixers.

They're in the thread called "buffering neutral fixer:

(there was a url link here which no longer exists)

It was harder to explain than I had hoped; sorry about the complication, but it's about the best I can do.
 
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