Re: cyanotype / Christopher James book

From: Giovanni Di Mase ^lt;gdimase@hotmail.com>
Date: 08/26/05-04:12:15 PM Z
Message-id: <BAY105-DAV8AB0FA1684BD2B815EAAEBFAA0@phx.gbl>

Thanks Loris,

What would you do if the new cyanotype doesn't give you an intense blue, would you coat twice or increase the ammonium dichromate?
Giovanni
  ----- Original Message -----
  From: Loris Medici
  To: alt-photo-process-l@sask.usask.ca
  Sent: Friday, August 26, 2005 9:21 AM
  Subject: Re: cyanotype / Christopher James book

  Giovanni,

  I intensify the blue by double coating (that's for classic cyanotype, the new cyanotype gives me satisfactory dmax with just one coat). This works for some, doesn't work for others. Try for yourself. The tricks are: coat very thin, let the paper dry for at least 30 mins. before coating the second layer and coat carefully without causing abrasion (you have to use a very good brush for the latter - I use "da Vinci" brushes). This practice will also cause a significant change in the contrast of the emulsion (more contrasty), so you will need to recalibrate.

  I also know that there are people using 2:1 (A:B) proportions; they say the emulsion is faster that way (I don't know if this affects the dmax or contrast - probably it doesn't). Anyway, that's one more thing to try.

  If you're not happy with your dmax, I strongly suggest that you try The New Cyanotype. It's not that hard to prepare it.

  Regards,
  Loris.

    ----- Özgün İleti -----
    Kimden : alt-photo-process-l@sask.usask.ca
    Kime : alt-photo-process-l@sask.usask.ca
    Gönderme tarihi : 26/08/2005 15:36
    Konu : Re: cyanotype / Christopher James book

    Thanks.
    I always thought and understood that the cyanotype was a very strict and limited composition of ferric ammonium citrate and potassium ferricyanide but according to James book you can intensify the blue and make further changes, if this is valid then changes my complete concept of a cyanotype process.
    I haven't heard anybody comments, I did read several weeks ago of somebody trying to intensify the blue but I can't trace the thread.
    Giovanni
Received on Fri Aug 26 16:14:05 2005

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