Van Dyke questions
Bruce McCaughey (dcav@unixg.ubc.ca)
Tue, 18 Feb 1997 23:08:19 -0800
I have two related questions that I could use some help with.
Question #1 There has been some discussion recently about the permanence of
Van Dyke prints. Some how I missed the answer, is there a problem with
fading? The reason I am asking has to do with two prints I have on the wall
that seem to be fading before my eyes. What would cause this? If it was a
fixing or washing problem would they not be going darker? There may be a
connection between the answer to question 1 and the problem in question two,
so read on before answering.
Question #2 The prints are also not getting a very high dmax to start with.
I have used the same chemicals on another paper and the dmax is much darker.
This is were it gets too complex for me. The paper I am using is my own hand
made paper using rag linters and a liquids sizing called Hercon 70(this is
an internal sizing not a surface sizing). I have used the recommended amount
of sizing in relationship to the linter but this was not designed for the
Van dyke process. The results are OK but could be better. The dmax is not up
to standard and there is a grainy texture. What I need to know is if the
result would be better if I added or reduced the sizing. Some sizing is
required to bind the pulp together during the processing and washing. Does
the Dmax increase with more or less absorbance into the paper.Is it also
possible that the Hercon 70 is effecting the chemicals and causing the
prints to fade.
Obviously I need to do some more testing but if any one has any
hints to put me on the right track I would appreciate the help.
Bruce