ACTSNYC@cs.com on thu 18 nov 99
In a message dated 11/17/99 10:25:21 AM Eastern Standard Time,
eiblodge@freenet.edmonton.ab.ca writes:
> This is a big question!
> May be to Edouard Bastarache,Ron Roy or Monona Rossol.
> While reading peter beard's book, Resist And Masking Techniques, advising
me
> how to prepare wax-resist crayons,with or without,colorants I decided to
try
> my old and forgotten Oil Bars. Oil Bar is an excellent quality of oil paint
> shaped like pastels,and made out of the best pigments.I had ^04 firing so I
> took a piece of terra cota painted with some colors and between them I
> applied engob.
> The Titanium white, became off white.
> The "Windsor" green ( Windsor - Newton ) Disappeared,so it acted as wax
> resist.
Winsor Green is primarily an organic pigment that would be destroyed by heat.
It is PG27, CI # 74260=polychorinated copper phthalocyanine. There's not
enough copper so as you would notice it, but there are 15-16 chlorine atoms
per molecule so you put out a little hydrochloric acid by burning it in the
kiln.
> The chrome green, did not change, <
Real "chrome green" is lead chromate (PG34). Sheesh. I hope it wasn't.
"Chrome oxide green" is chrome oxide and let's hope that's what it was.
> The light cadmium yellow became medium yellow
> The Cadmium orange and red became brown and shiny.
These might be all cadmium -- but they are old and might just as well be
cadmium sulfide/mercury sulfide complexes. I hope to hell you have one good
ventilation system on your kiln. I don't think this is the brightest thing
you've ever done.
> There is a transparent oil bar that can be a nice wax -resist.
> At my 'painting days' I loved to work with the oil pastel. Thinking that I
> can paint with them on ceramics makes me real glad. But what about the
fumes
> of the cadmium or other binders of this lovely material?
> Thanks, Ababi <
Find out for sure what each pigment really is first. Then figure out what it
will do in terms of color and fuming and see if it makes sense. Talk to
Winsor & Newton folks and tell them the year in which the colorants were
purchased.
By the way, if the person you talk to at Winsor & Newton is smart, she/he'll
tell you not to do this at all. So will I.
Monona Rossol
ACTS
181 Thompson St., # 23
NYC NY 10012-2586 212/777-0062
ACTSNYC@cs.com
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