Kaden K.
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 p.1 #7 · Opalotypes and Orotones | |
One could use plexiglass as a substract for collodion or for carbon tissues or even
other unusual types of substracts. The thing about plexiglass with collodion is that
to reuse it (in case of a mistake) unlike glass it must be done with the swipe of the
hand to clean it off and while wet. Once dry using a razor blade would scratch the
plexi which seldom happens with glass.
In carbon prints the gelatine dries pretty strongly making the substract only usable
once.
I have in the past used black plexi glass for ambrotypes because of its beautiful
shine. All in all glass is a better choice though and one with plenty of tradition.
As far as I can tell plexi is used in Europe more often because it is cheaper than
glass in certain countries.
As to subbing plates, no subbing is necessary for carbon printing with glass and the
developed out paper was fixed making it gelatin on gelatin. The negatives in collodion,
only the dry plates are subbed with albumen which is an interesting process requiring
a humidifier.
I know some folks that sub the edges of their ambrotypes whether it is glass or plexi,
basically to give it more traction but I never sub mine. Instead, I clean them very well
and haven't had issues thus far.
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