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> Archival RC prints? |
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#11
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FB papers use baryta coating (Barium Sulfate) which is chemically stable while Titanox (Titanium Dioxide) used in RC papers is not. It is light sensitive and generates free radicals. This releasing is repressed in modern papers, but was the main cause of deterioration in the 70s. Still, if a print is exposed to strong sun radiation (or polutants), some free radicals can start to generate. Also silver ions can be released by light. If this happens to a FB print, the ions can escape trough fibres, with RC prints, the ions can't escape trough the PE layer, so they accumulate as metallic silver on the surface. This is called bronzing The most stable are probably cotton papers with no baryta as baryta is the most difficult to wash. But nothing is trully arcival - a stone sculpture perhaps |
#12
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Thanks, Miha. You are right - lots of factors, some poorly understood. And I was not aware that there was a chemical difference between the reflective interlayers in FB and RC (I did most of my phototech work on colour emulsions, which have been RC since the late sixties). But I just checked the wash recomnmendations for FB and RC - very different. I also noted that Ilford recommend Selenium toning for extended RC image permanence.
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#13
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I started using RC papers, Ilfospeed in 1976 as a student in larger than 8x10 sizes to help drying flat. I have three 16x12 prints from then framed and hung on the wall now for twenty years without deterioration, I compare them with 10x8s from the same negs, kept in portfolios away from light, sometimes.
I was taught to fix and wash properly and probably still do overdo RC papers. I use FB papers because I want the surface, semi/matt sometimes to work on or the warm tones. (Just bought a box of Forte warmtone on ebay and keeping fingers crossed it's OK).I use a wash aid and leave them in running water for an hour at least and not in winter when the tap water is cold. I've not seen any bronzing on RC papers myself but have seen plenty of silver migration on traditional papers, mainly old vintage prints that I like to collect, but also on more modern ones that I can date by the subject matter. The only problems I've had with getting a good dense black is with old papers that are losing it a bit, RC or FB. I look out for this as I shoot things against a black background a lot. |
#14
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Resin Coated V Fibre
For me it is a personal preference and that is for fibre every time where I have a print that I want to have just that 'little bit extra'. I always had a feeling that resin papers were as long lived as fibre and possibly easier to get into that condition where they would last, but the finish of a resin paper can in no way match that given by a fibre based print.
The base of the print on which the emulsion is coated is a bit on the thin side and does not give the image 'depth' if I can explain it that way. The only surface that I have found that comes, or came close to it, was the semi matt finish of the now extinct Agfa multigrade types although Kentmere semi matt isn't far behind. |
#15
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I agree about Agfa RC MG papers. I've used a lot of them, and Jessops own brand when it was rebadged Agfa. They were quite punchy. The last lot I've used had lost some contrast and maximum black. These were the ones in a plain red box, older I believe that later stock which had a B+W photograph on the front.Using Bromophen and fiddling with filters helped.
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#16
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AGFA MCP 310/312 and MCC 111 papers are available as ADOX MCP 310/312 and MCC 110 papers as you sure know.
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#17
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I also have used a lot of both the Agfa RC papers and the Jessops re badged agfa papers, always in the semi matt, and liked them a lot, very punchy, and a bit of warmth, I have yet to try the adox re make of the agfa paper, but others who have that I have spoken too reckon that they are identical to the old Agfa paper, so perhaps next time I order I will get a box to try, I use a lot of the Kentmere VC select, and find it is also very punchy, good blacks and good tonal range, I agree with John that the '' feel'' of FB paper, is perhaps better, but I personally prefer the look of my prints on RC, I believe that some printers print better on RC and some print better on FB, and I am one of the former,. Another point with the Kentmere paper is that it tones in Sepia very well, as did the old Agfa paper, they were among the top toning papers in RC. as for longetivity, I made a print for some friends of mine at least 30 years ago, maybe more,on early RC, it has spent a lot of it's life framed on their wall, and it is as good as the day I made it,I think that as long as RC paper is processed to archival standards, A lot easier with RC than FB, the print will easily last as long as a print made on FB, and longer if the FB paper is not washed Etc properly.
Richard
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#18
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Terry S |
#19
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Steve. |
#20
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Image bleaching occured with some papers stored in plastic display files and similar storage. Ian |
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