[alt-photo] casein on metals
pfriedrichsen at sympatico.ca
Thu May 5 20:11:21 GMT 2011
I heard mention of casein as being a candidate for coating on
metal...I think it was Marek, so I thought I would pass on my experience.
I have successfully coated, exposed and developed casein+dichromate
on copper, aluminum, and even glass but there are challenges:
First, the metal must be very clean. I clean the surface with steel
wool and a dusting of laundry detergent and scrub for several
minutes. Some other cleaners such as dish soap don't seem to work so
well. You will know the metal is clean when the water sheets off of
the metal after a few minutes of rinsing. It is important that it
sheets off, as any beading up will mean that the casein will not
adhere sufficiently during development. Coating an even film on metal
is a bit trickier than paper and I find that of all things, a
silicone basting brush works well. Watch our for any bit of dust as
it really shows itself on metal. Cleaning foils may need some other
type of approach because they are so thin.
Even once you get the coating method perfected, you have a problem if
you are hoping for tonality and that is that there won't be any.
Lightly hardened casein (grey tones) prefers to stick to itself
rather than the metal so it sloughs off and the result is a two tone
image with no tones in between. I have heard that tonality can be
accomplished with a carbon tissue transfer onto metal using the
traditional carbon tissue but that does not involve casein of course.
I won't say it isn't possible with casein but that I have not had any
luck with it. There may be some type of undercoat that you could
apply to help anchor the less exposed casein but I have not attempted
it. An undercoat of powdered silica+hardened casein may do the trick.
If anyone has anything to add re metals/glass whether it is casein or
even gum, I am all ears.
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