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  1. #1

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    Mega Fixer Tests

    I've done a lot of research and a number of tests of fixer formulas and their speeds in the last week. This includes sodium and ammonium thiosulfate based, thiourea and ammonium cyanate, various concentrations and additives.

    The results might surprise you.

    PM for a copy in PDF. Or, paulv (AT) paulv.net .

  2. #2
    Bruce Osgood's Avatar
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    Why can't you just put it up here or in the Articles section?

  3. #3

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    Simple.

    Quote Originally Posted by Bruce Osgood View Post
    Why can't you just put it up here or in the Articles section?
    I couldn't see how to do it! Nothing there for new posts, just something about things being reloaded....for days.

  4. #4

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    Don't forget your email address.

    Quote Originally Posted by Paul Verizzo View Post
    I've done a lot of research and a number of tests of fixer formulas and their speeds in the last week. This includes sodium and ammonium thiosulfate based, thiourea and ammonium cyanate, various concentrations and additives.

    The results might surprise you.

    PM for a copy in PDF. Or, paulv (AT) paulv.net .
    Don't forget your email address.

  5. #5
    David A. Goldfarb's Avatar
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    You can attach a PDF to a post, just like you would attach an image, but the file size limit might be on the small side, so if you have it in DOC format, that's another option. Click on "Post Reply" and then "Manage Attachments" to upload the file.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  6. #6

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    Quote Originally Posted by David A. Goldfarb View Post
    You can attach a PDF to a post, just like you would attach an image, but the file size limit might be on the small side, so if you have it in DOC format, that's another option. Click on "Post Reply" and then "Manage Attachments" to upload the file.
    Thanks, I'll do that later today.

  7. #7

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    OK, here it is as an attachment

    I hope I did this right......
    Attached Files

  8. #8
    David A. Goldfarb's Avatar
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    Came up fine here. Thanks for the report.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  9. #9

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    Quote Originally Posted by David A. Goldfarb View Post
    Came up fine here. Thanks for the report.
    Thanks for the help! I'm still pretty new on the system here.

  10. #10
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    Well, what is your definition of fixing time? Is it 2x the time to clear? Or what?

    Also, there is a sweet spot as shown in Mees, and Mees and James.

    If SuperFix and TF-3 or 4 have the same pH, something is wrong. SuperFix should be about 6.3-6.7 and TF3 and 4 should be around 7.5 - 8 or somethng like that.

    Wet and dry is important, but the results are consisant within a test depending on how you do it and how you measure rates. You have to look at the back of the film. Also, wash rate is important and is determined by the fixer, and fix rate is often determined by the preceding bath (rinse or stop)

    BTW, due to the average thickness of film, dry film requires about 15" for fixer to diffuse to the bottom.

    Oh well, I've been doing this for years now.

    PE

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