Thanks for possible formula. I guess my real interest was the "work-around" due to Sodium Ascorbate not wanting to dissolve into glycol.
Now, back to PC-TEA!
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Thanks for possible formula. I guess my real interest was the "work-around" due to Sodium Ascorbate not wanting to dissolve into glycol.In that case the only solution is to make a water based concentrate.
Some people say Phenidone keeps well enough in a slightly acidic solution along with some sulfite but Fenton reaction would quickly kill the ascorbate.
You would need distilled water and cleating agents like DPTA5Na or EDTA2Na.
A possible formula would be:
FX-55.CW (Concentrate-Water based)
Solution A
Potassium Carbonate 8g
Sodium Bicarbonate 0.6g
Sodium Sulfite (Anhydrous) 10g
Water to 100mL
Solution B
Cleating agents (DPTA5Na/EDTA2Na) 1g -----Always add this first
Phenidone 0.4g
Ascorbate 5.2g
Sodium Bisulfite 4.8g
Water to 100mL
When I mix up Pyrocat-HD, I always dissolve the required amount of Phenidone in a bit of Isopropyl Alcohol, before adding it. Goes in easily. Heat up the TEA to say about 50C, and give it a whirl.
I had a feeling I had once seen John Finch dealing with PC-TEA so I searched his videos again and found the one that covers it. In it he uses propylene glycol instead of isopropyl alcohol in which to dissolve the phenidone giving it a keeping property that can be measured in years. He then heats it very gently for 2 x10 secs in a microwave to preserve all the properties of the phenidone, his test being whether he can easily hold the beaker in his bare hand while stirring. He applies the same test to his ascorbic acid in TEA except that his time he uses 1x20 secs plus 1 x10 and again while the beaker is slightly warmer than was applied to phenidone it is still hand-holdable He then allows the TEA to cool before adding the phenidone in glycol to ensure that phenidone's properties cannot be adversely affected
He does say if the temperature of either is 60c but I suspect it may even be less and certainly no more than 60c
So this may be an alternative way and might accord exactly with your quote above, Andy
Anyway should anyone be interested in this video here it is. The bits about what I describe above is from 3:30 to 8;15 in terms of the phenidone and about 10:30 to 14:00 in the case of ascorbic acid
I hope this helps anyone here interested
pentaxuser
Those who watch the mini player as it appears on Photrio do not see the comments posted on YouTube's website. Might be a good idea to repeat any information the viewer needs to know wherever the video can be viewed?
No offence intended, but personally, I would much prefer to read a text summary, and skip the YouTube video, altogether. When reading text, I can quickly skim over the information I already know -- and I can stop and re-read anything I don't understand. Or I can copy and paste something I want to know more about into a search engine. Whether the information is simple or complex, relevant or off-topic, video presents all information at the same rate. And if the pace is too fast, or too slow, too bad. There are some processes which are best shown on video, but for everything else, text just works better for me.
Actually, I just realised that there is a transcript button in the description. You click on it and presto! Transcript! If you click on any of the lines in the transcript, it'll go to that part of the video.
Even us old timers who know everything learn something new every now and again. Thanks, Andy!
I had a feeling I had once seen John Finch dealing with PC-TEA so I searched his videos again and found the one that covers it. In it he uses propylene glycol instead of isopropyl alcohol in which to dissolve the phenidone giving it a keeping property that can be measured in years. He then heats it very gently for 2 x10 secs in a microwave to preserve all the properties of the phenidone, his test being whether he can easily hold the beaker in his bare hand while stirring. He applies the same test to his ascorbic acid in TEA except that his time he uses 1x20 secs plus 1 x10 and again while the beaker is slightly warmer than was applied to phenidone it is still hand-holdable He then allows the TEA to cool before adding the phenidone in glycol to ensure that phenidone's properties cannot be adversely affected
He does say if the temperature of either is 60c but I suspect it may even be less and certainly no more than 60c
So this may be an alternative way and might accord exactly with your quote above, Andy
Anyway should anyone be interested in this video here it is. The bits about what I describe above is from 3:30 to 8;15 in terms of the phenidone and about 10:30 to 14:00 in the case of ascorbic acid
I hope this helps anyone here interested
pentaxuser
Did you read the transcript? Here is a snippet:Actually, I just realised that there is a transcript button in the description. You click on it and presto! Transcript! If you click on any of the lines in the transcript, it'll go to that part of the video.
The transcript stops at the 8 minute point in your 10.5 minute video.
Of course, you must please yourself first; every artist must. Except for those YouTube professionals who depend on likes and ad revenue to support their families, and must do whatever it takes to keep their followers clicking. I suppose that is no different from the compromises we all must make to earn our bread. Only the amateurs among us can afford to do whatever they want, and ignore what others think about their work. I hope you enjoy the luxury of being among the amateurs! And I mean that sincerely, without irony!Some people are just impossible to please
Of course, you must please yourself first; every artist must. Except for those YouTube professionals who depend on likes and ad revenue to support their families, and must do whatever it takes to keep their followers clicking. I suppose that is no different from the compromises we all must make to earn our bread. Only the amateurs among us can afford to do whatever they want, and ignore what others think about their work. I hope you enjoy the luxury of being among the amateurs! And I mean that sincerely, without irony!
Actually, I was pleased to read the transcript of your YouTube video. It was very amusing! And it allowed me see some differences and connections between spoken language and written language that I had not noticed before. I now have a higher appreciation for punctuation. The entire spectrum of language from precisely written text to spoken dialects and obscure slang at the very edge of communication are all interesting to me.
It is also interesting to watch our AI babies as they grow up. YouTube's transcription 'bots have developed past the "goo-goo, gah-gah" phase, but cannot yet understand human language like fifth-graders, much less adults.
So, please forgive my unsolicited feedback, no offence intended. And keep doing what you enjoy most! Even if there are a few swine who turn up our snouts at your pearls.
Well, I'm certainly no YouTube professional. I make no money from it. It's a labour of love. .
What counts is that your videos are both chatty and easy to understand - not an combo that is achieved often What you do and conclude is what you demonstrate on screen. I am not sure what else anyone can ask for in a video
pentaxuser
Andy: I posted a query on the youtube before realizing you had posted here as well. On the chance you look here more often, my question regards comparing grain in PC-TEA to PC-512... which my eye sees one way but may not be a big deal ...as sometimes grain can prove a product of scanning. FWIW, some scans of the SAME film, SAME developer, etc. off the SAME roll have been known to show different levels (appearances) of grain. Not sure I understand that yet.... just discovering how it annoys me is a start.
As to BW&G, I admit that I belong to that impatient class of photographers who hates working with “the goo” that is the BW&G syrup. My darkroom stays pretty cold, particularly in winter, adding an extra step whereby I have to heat up the bottle just to be able to extract the syrup. As a result, I developed a couple of rolls and then moved back to less viscous/easier to manipulate developers.
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