Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,948   Posts: 1,557,864   Online: 830
      
Page 2 of 2 FirstFirst 12
Results 11 to 18 of 18
  1. #11
    Adrian Twiss's Avatar
    Join Date
    Jan 2004
    Location
    Wigan (oop North) United Kingdom
    Shooter
    Multi Format
    Posts
    612
    Images
    10
    Quote Originally Posted by Helen B
    I've just heard that Barry Thornton's shop will not re-open. That's a shame - but I'm sure that Barry and his developers won't be forgotten.

    Best,
    Helen
    I have just had a look at Barry's website and there is no post confirming this. Just curious to know where you heard this from.

    Adrian

  2. #12
    Leon's Avatar
    Join Date
    Dec 2003
    Location
    Kent, England
    Shooter
    Medium Format
    Posts
    2,075
    Quote Originally Posted by Tom Stanworth
    From the comments I have read, it sounds like Exactol Lux is a little finer grained and less sharp than Pyrocat and Dixactol sharper and grainier. Would that seem fair?
    from my experience, that is exactly right Tom.

    Looking at the monochromephotography.com site, even the logo is frighteningly similar to Barry Thornton's logos for his products ... I wouldnt be suprised if we eventually found out that Peter Hogan had obtained/ bought the formulae for Barry's old products. Shame they couldnt be published though ... i can see no other reason for the family not agreeing to publish the formulae.

    I too am well settled into my pyrocat regime, but would be interested to hear about Presysol.

    BTW - anyone in UK who used to use Barry's alkaline fixer ... retrophotographic.com have started to sell a powder kit alkaline fixer - saves having to buy tf-4 and pay loads of shipping fees. I have one to try, but havent mixed it up yet.

    It's sad that the Barry Thornton website will close too ... there is quite a bit of useful information there.

  3. #13
    Leon's Avatar
    Join Date
    Dec 2003
    Location
    Kent, England
    Shooter
    Medium Format
    Posts
    2,075
    Quote Originally Posted by Adrian Twiss
    I have just had a look at Barry's website and there is no post confirming this. Just curious to know where you heard this from.

    Adrian
    Adrian - this email was sent out last night to those on the mailing list

    "It is with great sadness that Kate Thornton has decided that it is not possible to carry on with the shop or this web site. I have spoken to her and found that there will be no more chemicals or books. I will keep the web site on-line until the next renewal date and then it will be closed. For this reason I will no longer be able to take questions on this site.



    I am sorry that you have all waited so long to hear this news, which I know, is very disappointing.



    However;

    As one thing stops another starts. I am in the process of completing a web site for some new photographic chemicals. The site, owned by Peter Hogan (a friend of Barry’s), will be open for sales in the near future. In my opinion, with my photography teaching background, I would say this is well worth your serious consideration.



    The web site is at www.monochromephotography.com and contact can be made on info@monochromephotography.com



    As the webmaster for this new site I would be happy to answer/pass on any questions



    Regards



    Andy Hollingsworth

    andy@awhimaging.co.uk

    www.awhimaging.co.uk"

    a sad day!

  4. #14
    Adrian Twiss's Avatar
    Join Date
    Jan 2004
    Location
    Wigan (oop North) United Kingdom
    Shooter
    Multi Format
    Posts
    612
    Images
    10
    Leon

    I think I am on Barry's mailing list but have not downloaded any emails since early yesterday evening.

  5. #15
    Dave Miller's Avatar
    Join Date
    Dec 2003
    Location
    Middle England
    Shooter
    Medium Format
    Posts
    3,894
    Images
    2
    Quote Originally Posted by Leon
    It's sad that the Barry Thornton website will close too ... there is quite a bit of useful information there.
    Thanks for the link Leon, it seems like a good time to do a little (actually a lot) of downloading and printing! Some of the information is available in Barry's books, but there is quite a bit that isn't.
    Regards Dave.

    An English Eye


  6. #16

    Join Date
    Mar 2003
    Location
    Greenville, SC
    Shooter
    Large Format
    Posts
    4,813
    Images
    5
    Quote Originally Posted by Tom Stanworth
    There may be significant similarities, but I'm sure Les will let us know if this bears out in practice. If we are honest, Exactol Lux and Dixactol Ultra (both of which I have used) seem VERY close to Pyrocat HD(not that I have used it yet). From the comments I have read, it sounds like Exactol Lux is a little finer grained and less sharp than Pyrocat and Dixactol sharper and grainier.

    Based on various published comments by Barry Thornton this is what I believe about his developers. Obviously I am speculating in many cases. .

    1. Dixactol -- The original Dixactol was designed to function as a two-bath developer but Thornton very soon after it was introduced provided instructions for one-bath development with the suggestion that some of the modern films did not respond well to the two-bath method. Like Pyrocat-HD Exactol was provided in Stock Solution A and Stock Solution B, which were mixed shortly prior to development. Stock A consisted of the reducer pyrocatechin and glycin. It is likely that Stock A also contained some bisulfite or metabisulfite for the preservative and also possible a restrainer such as bromide. The accelerator for Diactol was either one of the carbonates or one of the hydroxides. I suspect the hydroxides because of grain size. Borax, metaborate, etc. would not work with this formula because the threshold of developer activity of pyrocatechin is pH 9.

    Thornton described Diaxactol as razor sharp and people who have used it agree. It has grain similar to that of PMK and slightly larger than Pyrocat-HD.

    2. Exactol -- Thornton refined Dixactol by adding some phenidone to the pyrocatechin and glycin. And because of reduced grain size my suspicion is that he changed to potassium carbonate as the accelerator. The dilution for Exactol was 1:1:100 for silver printing, same as Pyrocat-HD, which leads me to suspect that there are some strong similarities in composition between the two. But Pyrocat-HD does not contain any glycin of course.

    Thornton described Exactol as giving finer grain than Diaxactol, but without quite the cutting sharpness. I will have to rely on the comments of others since I never used it.

    3. Dixactol Ultra -- Probably also contained pyprocatechin + glycin + phenidone, but the working pH appears to have been lowered because Thornton mentioned longer development times but finer grain. If that is indeed the case it seems likely to me that more of the development action would have been shifted to the glycin and phenidone.

    Just some thoughts in case anyone might want to try to recreate some of the Thornton formulas.

    Sandy
    Last edited by sanking; 08-11-2004 at 09:20 AM. Click to view previous post history.

  7. #17
    Leon's Avatar
    Join Date
    Dec 2003
    Location
    Kent, England
    Shooter
    Medium Format
    Posts
    2,075
    Sandy - thanks for that. I seem to rememeber reading somewhere that you tried adding glycin to the pyrocat recipe - if I am right what was the effect (I cant find any details about it)

  8. #18

    Join Date
    Mar 2003
    Location
    Greenville, SC
    Shooter
    Large Format
    Posts
    4,813
    Images
    5
    Quote Originally Posted by Leon
    Sandy - thanks for that. I seem to rememeber reading somewhere that you tried adding glycin to the pyrocat recipe - if I am right what was the effect (I cant find any details about it)
    No, that was Clay Harmon who reported that in another thread. He reported possibly more contrast and a nice purple color to the user developer but apparently Clay did not take the experiments very far.

    Sandy

Page 2 of 2 FirstFirst 12


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin