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Re: Etching Question

Hey there.  I think we have been using "oxidiation" to refer to two
different phenomena:  the oxidising of the metal plate itself, and the
interaction of certain inks with certain metals.  Zinc does indeed oxidze
when in contact with water and air; to experience this, just wet a zinc
plate and let it stand for a day or two (or wrap it up in damp paper).  Fun
home science experiment, like growing mold on bread.  The second
"oxidization", with ink, occurs when certain pigments, such as the cadmiums,
react to the metal plate, causing a color change.  This is most obvious with
zinc and cadmium yellow (it goes green).  So certain colors are better to
use on copper.  Alternatively, you can spray your zinc plate with pastel
fixative, forming a barrier between the metal and the color.  Happy
printing.  Audrey

Janet L. Meyer-Borders wrote:

> Hi, having been a printmaker and having gotten a degree in printmaking
> I think I have a few questions to ask everyone about oxidation.
> Since when is oxidation white?  I have yet to have any of my 50 or so
> plates that are zinc turn white, and they have truely been abused.
> I think that oxidation is a term used a bit loosely here, but maybe
> I need some type of an education on my zinc plates turning white.
> Also if you would like to know everyone of my copper plates have turned
> green over the years, no matter what I have done, because they get air
> on them, and they turn.  Almost like a sculptural finish on a bronze
> statue that is hundreds of years old.  Anyway, maybe someone can fill me
> in on this magic stuff call oxidation????
> Thank-You
> Hi - this is Janet - I am an artist - do you need any art work?
> Give me a call.  Logos, Murals, Signs - jmeyerb@xxxxxxxxxxxxx

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