ruilourosa
Member
PC tea and 510 pyro are not issued nor TEA as a solvent...
Pertaining results ir phylosophy?
Pertaining results ir phylosophy?
It has to do with Triethanolamine... As a solvent and as a silver solvent...
PC tea is at worse a speed maintaining developer... And if mixed with some sulfite it will probably be a speed increasing Dev.
Has every developer formula described in their book been actually tested by them on at least a few films? What is the criteria for inclusion of a formula?
FDC 2020 p111-112 wrt TEA concludes ".....we don't like its silver solvent effect on film"
Mostly, it is just a liquid alkali useful for making liquid kits! The solvent action for Silver Halide that is attributed to it is generally due to impurities such as DEA. It is a very weak solvent and a very weak chelating agent. It is very good for making water free liquid kits such as HC110.
So it would seem,from what is being said by various posters, that Anchell and Troop have excluded those developers which they regard as inferior or otherwise less reliable? Is that a fair assumption on my part? If it is not a fair assumption then exactly what is it that causes them to exclude TEA and 510 Pyro?
It may be reasonable to state that a drawback of 510 Pyro is that it stains the reels compared to other staining developers but is this really the case?
John Finch of Pictorial Planet fame has done videos on 510 Pyro as have others and while I haven't seen all the 510 videos I have seen a few and nowhere does he even hint at the staining of the reels, nor can I recall others mentioning it. From what I have seen of his many videos he is normally very careful about covering all aspects and I'd have thought that serious staining deserved at least a mention
So is the staining such that the normal washing of the reels after the process is finished is insufficient to remove it?
Thanks
pentaxuser
IMO, Anchell and Troop did not include 510 pyro because the data was incomplete, I think it still is.
Apologies for mentioning staining of reels many years ago, not to be taken as a serious claim, I deleted it.
Thanks good to know that 510 Pyro does not lead to a stain on the reels
pentaxuser
510 pyro would have been a work in progress when the Film Developing Cookbook was being prepared for publication in 2020.
The formula was changed by the inventor to 0.375g phenidone and times published in 2017 on Flickr.
Too much uncertainty to be included in FDC maybe.
FDC 2020 p111-112 wrt TEA concludes ".....we don't like its silver solvent effect on film"
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