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  1. #21
    pstake's Avatar
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    Gerald,

    How do you know so much? Are you a chemist or did they actually teach this at a photography school at some point?

    I'd love to have this understanding of photochemistry.

    Thanks, again for all the info/advice — everyone.

    Cheers,
    Phil

  2. #22

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    Hi Phil,

    Yes, I am a trained chemist but my interest in photography caused me to read and re-read many of the classic books on photochemistry like Mason and Glafkides. The most up to date book is the two volume set by Grant Haist. A course in solid state chemistry was helpful in understanding what happens when radiation impacts certain solids like glass and the silver halides.

    Jerry
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  3. #23
    Thomas Bertilsson's Avatar
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    Instead of using restrainers, I have used Brovira and printed it with my standard LPD (replenished) chemistry. Whatever fog is there in the paper I have bleached back with dilute pot ferri. Refix and wash.
    It helped me, because I don't have any benzotriazole handy, but I have plenty of bleach.
    "Often moments come looking for us". - Robert Frank

    "Make good art!" - Neil Gaiman

    "...the heart and mind are the true lens of the camera". - Yousuf Karsh

  4. #24
    cliveh's Avatar
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    Quote Originally Posted by Thomas Bertilsson View Post
    Instead of using restrainers, I have used Brovira and printed it with my standard LPD (replenished) chemistry. Whatever fog is there in the paper I have bleached back with dilute pot ferri. Refix and wash.
    It helped me, because I don't have any benzotriazole handy, but I have plenty of bleach.
    Thomas, just wondered how the pot ferri differentiates between fog and normal tonal values?

    “The contemplation of things as they are, without error or confusion, without substitution or imposture, is in itself a nobler thing than a whole harvest of invention”

    Francis Bacon

  5. #25
    Thomas Bertilsson's Avatar
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    Quote Originally Posted by cliveh View Post
    Thomas, just wondered how the pot ferri differentiates between fog and normal tonal values?
    It doesn't.

    You have to do a couple of test prints to figure out how to properly expose your print in order to come up with something that looks good once you're done.
    "Often moments come looking for us". - Robert Frank

    "Make good art!" - Neil Gaiman

    "...the heart and mind are the true lens of the camera". - Yousuf Karsh

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