Re: Gum-Platinum / Cyanotype-ceramic
eml@gate.net
Tue, 19 Dec 1995 10:48:33 -0500 (EST)
SCHRAMMR@wlsvax.wvnet.edu
>
> mix various clays and glazes. It seems to me that a lot of them are
> bases. So I would think that the first step in making this work would
> be to get rid of or neutralize the bases. There are chemical indicators
> that will tell you the approximate pH of substances. Universal Indicator
> comes to mind. Perhaps consultation with a chemist would be in order.
>
> Bob Schramm
> West Liberty State College
>
Almost all glazes that I have seen contain basic compounds, and much
glass is mildly alkaline. In fact, some brown glass laboratory bottles
are made from glass which specifically does not have an excess of
alkali. I have seen listed in some scientific supply catalogs
something called a "pH Pen", which apparently contains an "ink"
which contains pH sensitive dyes. Whether these would work on
fired pots, frits, or glazes is anybody's guess, but they are
available, and not expensive.
Of course, though you would not get a finished Prussian Blue image,
has anyone tried firing the transferred cyanotype? It should
come out either burnt siena oe black, I would think. Just a
question from someone in far over their head!
Ed Lukacs
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