||The top image on
the left shows the piece as it was designed.
image underneath it is the mask. The size of the outline is
the same as the one above, making it easier to line it up on
top of the initial wash-out. Make sure the mask is very solid
black, if it is not, double it up!
Then there is the finished plate, washed out to
And the resulting PMC piece, shown here with a
liver of sulphur patina.
(This piece has since been enamelled)
The basic procedure is simple:
1. Expose the image as you'd
2. Wash out the whole plate to the depth of
the shallow area, I check for depth with my fingernail.
3. Dry the plate with a sponge, no paper towels
or cloth, to avoid fibres being trapped in the sticky polymer.
4. Place the mask over the areas you want deeper,
making sure to have the mask precisely in place. This is where
the registration marks come in handy, look through the ones
in the mask to see the half washed out ones in the plate. Put
the whole lot back into the exposure frame, very carefully so
as not to move the artwork, then clamp using the bulldog clips.
5. Expose the plate again for the same time
as before with the mask on, this will post expose the texture
area only, hardening that whole area.
6. Remove the mask and wash out all the deep
areas, the shallow areas are now hard and will not wash out
further, while you can take the deeper lines all the way down
to the base layer.
7. Dry as you normally would, then post expose
the whole plate for the same time again.