>I have recently suggested to the list that a first coat of dichromated gum or
Gloy works very well as a foundation. Peter Frederick says that he has confirmed
this in tests he has made. The sensitised gum is dried in the dark and then
exposed for two or three minutes, and then washed to remove the traces of
Dichromate, before the first coat of pigment is applied. I did think of a name
for this method.
The method works well for hot pressed papers.<
Yes I can confirm that this method does work well, however there can be a
few problems associated with its use. The exposure required to set the
layer is very brief and critical, I have test run this method at Kingsway
college KTC, we use a sunbed as an exposure unit, which gives us an
exposure of 3 to 10 mins when printing an average gloy gum print, using a
standard mix of 1 part , distilled water, 1part,saturated solution amm
Dichromate ,and one part gloy gum. With one part pigment to 10 parts
standard mix.
The standard mix is of course used without the pigment included for the
size, and the average exposure was found to be 10 to 15 secs, although I
watch my students like a hawk, we got from time to time exposures of 10 to
15 mins, giving us a nice chocolate brown colour, this things are
inevitable in a college situation, and gives us all a giggle ;-).
You can only use this sizing method once,
otherwise an unpleasant Dichromate stain builds up, resulting in a
degradation of the image.
I am still testing my dulux delight sizing method and am in the process of
trying out other brand names , I believe our emulsion paint is called
latex across the pond the term latex in England is usually applied to
rubber goods,how exciting ! .;-)
When I have made more progress, I will get to the list with the info , and
I promise not to give it a silly name, but I am afraid that Terry and I
have this awful Pythonesque disease that strikes without warning leaving
the poor recipient in a state of abject irrationality ;-)
pete