RE: acetone

Dick,

More than a month ago I wrote to the list with a question about a 'melting'
top layer of tissue while sensitising.

(We just stopped when the pigment started to come off the tissue.)

Can you tell me more about this.

Witho

-----Oorspronkelijk bericht-----
Van: owner-carbon@spitbite.org [mailto:owner-carbon@spitbite.org] Namens
Richard Sullivan
Verzonden: vrijdag 22 december 2006 19:52
Aan: carbon@spitbite.org
Onderwerp: RE: [carbon] acetone

  Vaughn,
  
  With a flooded brush method I believe there is a time/temp parameter. Last
summer when the print room was in the mid 90's (that's Deg F, not Deg C.!)
there was virtually no time/temp control. We just stopped when the pigment
started to come off the tissue.
  
  Even at that I've seen little change in the prints using the same
sensitizer % that was used in the summer.
  
  If you are shooting for relief, this may be a factor however.
  
  We will be producing a high relief tissue in the future and Sandy's data
will come in handy. Our first tissue to market will be standard type of
tissue since I think we can all agree the printing parameters are a bit
simpler for the novice. Sandy alluded to the edgy parameters on high relief
in a recent message.
  
  High relief is an issue of personal taste. I think it is somewhat like
brush marks on a pt print. I think it is an interesting and novel idea for
portfolio prints, but once under glass in a frame, it is not that visible. I
am sort of neutral on the subject. I think it would be nice for some prints
and immaterial for others.
  
  --Dick
  
  
  
  -----Original Message-----
From: owner-carbon@spitbite.org [mailto:owner-carbon@spitbite.org] On Behalf
Of Vaughn Hutchins
Sent: Friday, December 22, 2006 11:04 AM
To: carbon@spitbite.org
Subject: Re: [carbon] acetone
  
  Sandy and Howard,
  
  I noticed that you use half the sensitizer that I do.
  
  What changes in the print would I see (contrast/exposure), if everything
  else is kept constant and I used 15ml of sensitizer rather than 21ml for
an
  8x10?
  
  Would I pick up some deeper penetration of the UV due to less Ammonium
  dichromate due to less volume used (thus less UV blocked by the yellow of
  the Am. Dichromate)?
  
  Many thanks,
  
  Vaughn
  
  PS Dick's latest post arrived as I was composing my questions. The
method
  "perfected" by Howard seems to suggest that the amount is not critical --
  but perhaps I am wrong on this if Howard times his sensitizing and
controls
  amount that way. Or perhaps the gelatin absorbs as much as it can and
that
  gives consisantcy. Or is it strickly a matter of concentration -- not
  volume?
  
  Perhaps the larger amount of sensitizer I use helps reduce streaking?
  
  So many variables!!!!!
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Received on Fri Dec 22 16:20:43 2006