Brush vs tray

  What we do here, and it was "perfected" by Howard E. is sort of a hybrid
tray/brushing method. The print is placed in a tray and a very sloppy
brushing is done basically moving a flood of sensitizer across the tissue.
If you brush like you are doing a pt/pd or cyano print, as I always tried,
you will get streaking.
  
  I typically do tray sensitizing doing 3 or 4 16x20's or 2 20 x 24's. it
goes a lot faster this way than one-at-a-time. Sensitizing is not my
favorite part of the process. We teach the students the tray-brush method as
the tray method with multiple sheets is a bit of a challenge.
  
  --Dick
  
  -----Original Message-----
From: owner-carbon@spitbite.org [mailto:owner-carbon@spitbite.org] On Behalf
Of Witho Worms
Sent: Friday, December 22, 2006 10:10 AM
To: carbon@spitbite.org
Subject: RE: [carbon] acetone
  
  Cheers Sandy,
  
  I have tried it only once but got streaking. I will learn to do it.
  
  Regards,
  
  Witho
  
  -----Oorspronkelijk bericht-----
  Van: owner-carbon@spitbite.org [mailto:owner-carbon@spitbite.org] Namens
  Sandy King
  Verzonden: vrijdag 22 december 2006 16:23
  Aan: carbon@spitbite.org
  Onderwerp: Re: [carbon] acetone
  
  I am currently calibrating spirit sensitizing with a 1:2 mix of
  ammonium dichromate solution:acetone, using 8 ml of combined solution
  per 8X10" size tissue or the equivalent. A 12X20" tissue has three
  times the area of an 8X10 so for that size I would use 24ml of total
  solution, 8ml of ammonium dichromate solution + 16ml of ammonium
  dichromate. I coat twice, using half of the total solution with each
  coating. I use a foam brush, which I first wet out and shake to get
  rid of excess water, and for the second coating I wet it out again
  and shake.
  
  The foam brush works so well for me that I have not ever felt the
  need to try anything else. The sensitizer penetrates all the way to
  the base of the tissue using this method, as effectively as it does
  with tray sensitizing. I recall some speculation here in the past
  that spirit sensitizing might wet out only the surface of the tissue,
  but based on the kind of relief I am getting with spirit sensitizing
  it is obvious to me that is not the case.
  
  Sandy
  
  
  
  
  
  
  At 1:23 PM +0100 12/22/06, Witho Worms wrote:
>Sandy or anybody else,
>
>
>
>How much acetone - ammoniadichromate mix do you use for a 12x20 inch
>negative, tissue slightly bigger of course.
>
>
>
>And, have you ever tried to use a sponge, to rub the tissue in, so that
you
>more or less saturate the top of the tissue.
>
>
>
>Witho
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Received on Fri Dec 22 09:36:59 2006