Bauchet B&W Reversal Processing

Bauchet B&W Reversal Processing

  1. Ian Grant

    Ian Grant Subscriber

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    Ian Grant submitted a new resource:

    Bauchet B&W Reversal Processing - Bauchet B&W Reversal Processing

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    Last edited by a moderator: Feb 6, 2016
  2. Greg_E

    Greg_E Member

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    Thanks. Instead of exposing the film to light, do you know of a way to use another chemical bath to do the same thing?

    Also what about using different acids instead of the Sulfuric? Sulfuric is getting to be too much hassle to use, too much paperwork involved to get it. And shipping expense can be very high since it is a hazardous material.
     
  3. Ian Grant

    Ian Grant Subscriber

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    The alternative to re-exposure are to come, there are plenty of different alternatives but they need a completely separate listing.

    You can buy conc Sulphuric as drain cleaner US/UK with no paperwork so lets use what's best :D

    Ian
     
  4. Greg_E

    Greg_E Member

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    Not anymore in the US. Even the lye base drain openers are mostly gone. Can't even buy dilute sulfuric battery acid in the automotive parts stores. I assume I might be able to get sulfuric from the single photo store in town that still carries a good supply of chemicals, but I'm not sure. The damn government has taken most all the good chemicals away from us lately.

    Sorry for the rant.
     
  5. Paul Verizzo

    Paul Verizzo Member

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    I agree completely

    It was only yesterday that I discovered that Red Devil Lye is gone-ola by several years. About the time I bought my last.

    After a lot of internet searching I found the Lowe's has a 2 lb can of Roebic Crystal drain cleaner (IIRC) for $8.

    You might be able to get battery acid still from NAPA.

    You can also get weaker sulfuric acid from sodium bisulfate, aka pool pH decreaser. $6 for 3 lbs, typically. I use it for stop bath. And the pool.
     
  6. amuderick

    amuderick Member

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  7. domaz

    domaz Member

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    How concentrated does the sulfuric acid need to be here?
     
  8. Ian Grant

    Ian Grant Subscriber

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    It should be concentrated, 98%, but there's no reason why you can't use less concentrated provided you adjust the amount to compensate.

    Ian
     
    Last edited by a moderator: Aug 12, 2008
  9. gainer

    gainer Subscriber

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    You can make either potassium or sodium hydroxide with Slaked lime from the garden shop and either sodium or potassium carbonate. Calcium carbonate is precipitated. Slaked lime (calcium hydroxide) alone is not very soluble.