desiccated to anhydrous conversion

Discussion in 'Black and White' started by don_sigl, Jun 26, 2002.

  1. Does anyone know if there is a conversion process for
    translating "desiccated values to anhydrous or monohydrous values?
    I've got some formulas I want to try that list preservatives and
    accelerators amounts in desiccated form.


  2. Its the same thing, for all practical purposes.
  3. Hi Don,
    You could try this site, which has conversions from one form to another for a range of common photographic chemicals:
    There is other useful advice on the site too. I guess if you need to be accurate you have to be careful that the amount of water present hasn't changed too much with storage for some chemicals.
    Hope this helps, Simon
  4. Desiccated IS anhydrous. The two words mean the same thing.
  5. According to Jacobson & Jacobson (DEVELOPING), there are three forms of sodium carbonate: crystalline, anhydrous (or dessicated), and mono-hydrated. 100 parts by weight of anhydrous sodium carbonate equals 270 parts by weight of the crystalline salt or 120 parts by weight of the monohydrate. "These equivalents are not exact, but are quite near enough for all practical purposes."

    So, if your formula says 100 parts anhydrous or dessicated, you can substitute 120 parts monohydrate.
  6. Thanks all for the help. The Ansco formulas I'm looking at all have the Sodium Sulphite ingredient listed as desiccated. I am going to mix under the assumption that this means the same as anhydrous

  7. check Anchell Darkroom Cookbook. There are conversion tables in the back.
  8. check Anchell Darkroom Cookbook. There are conversion tables in the back.

    This came up a a little while ago. the table pretends to be a Universal converter, but it is really only good for sodium sulfite. But there is no conversion from dessicated to anhydrous

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