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  1. #1

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    Sep 2002
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    Willamette Valley, Oregon
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    Hardened = Tanned ?

    Helen B. provided some insight into the 'pink' hangover.
    I think she is suggesting that a tanned emulsion may be as
    difficult to wash clean as a hardened emulsion. Are tanned
    and hardened gelatins, in effect, the same thing? Dan

  2. #2

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    Tijeras, NM
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    Tanning is proportional to the negative density. If you look at a negative at an angle you will see a 'puckered' effect along the edges of high contrast. This is tanning.

    There are two ways that a film is hardened.
    1)Most modern films have a protective coating on the negative to keep it from getting scratched. Some of the old school eastern european/chinese films that are available today don't have a protective layer.

    2)Another way a negative can be hardened is with a hardening fixer. This has some sort of alumninum salt that binds to the gelatine.

    I think that tanning may effect washing but not in the same way that a hardening fixer would.

    Quote Originally Posted by dancqu
    Helen B. provided some insight into the 'pink' hangover.
    I think she is suggesting that a tanned emulsion may be as
    difficult to wash clean as a hardened emulsion. Are tanned
    and hardened gelatins, in effect, the same thing? Dan

  3. #3

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    Feb 2004
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    Minnesota Tropics
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    Quote Originally Posted by avandesande
    Tanning is proportional to the negative density. If you look at a negative at an angle you will see a 'puckered' effect along the edges of high contrast. This is tanning.
    .
    I thought tanning referred to a treatment of to an animal product, which in this case is the gelatin.



 

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