Tom Wirt/Betsy Price on wed 6 dec 00
The glass appears to be etched because most standard cleaners won't
touch it. Try "Soft Scrub'-rub it on thinly, let dry, wipe off the
haze. Cleans them right up..
Tom
>Subject: how bad is it? "Glass- Etched" ????
> From: Bonnie Staffel
> Subject: Re: how bad is it???
>
>. Being a "once in a while" housekeeper, thought
> I would wash my windows. They wouldn't wash. They were etched to
frosted
> glass. My intuitive mind then said the sulphur must have turned
into
> sulphuric acid when it came in contact with the moisture on the cold
windows
> and etched them. What happens when that sulphur gets into your damp
>
Philip Poburka on wed 6 dec 00
Dear Bonnie,
and everyone...
My recollection is that 'Sulfuric Acid' does not etch glass.
I believe 'hydro-flouric-acid'(sometimes call'd 'Hydrogen-Fluoride') will.
For which reason, it used to be kept in Beeswax carbouys, flasks and
'bottles'.(I suppose 'plastic' now-a-days.)
Perhaps in the elusive chemical confluences which may occur in the
exhalations of Kilns, there are the requisite conditions and elements for a
production of Hydro-Flouric-Acid.
Exposures to (gasses of) this Acid should be carefully avoided, perhaps even
more so than with Sulfuric in some ways, since I do not believe one would
'feel' anything in their presence. One may not notice any 'sting' or burn,
as one would with Sulfuric Acid. It is absorbed through the skin, or other
topographies, membranes...it is rightly considered quite 'dangerous' to
one's well being, tho' I do not remember much of the 'mechanism' of 'how'
so.
My recollection of this Acid when in liquid form, is that minor spills, etc
which occasion topical exposure result in painless migration of the acid
through the skin and flesh, where it thence dissolves bone or other
Calcium/phospherous ammenables...
Which, of course would be disconcerting!
Please be careful!
Just a thought.
Philip
in
las vegas
------Original Message------
From: Bonnie Staffel
To: CLAYART@LSV.CERAMICS.ORG
Sent: December 6, 2000 5:34:47 PM GMT
Subject: Re: how bad is it???
I could pass on an example of how bad it is. In my old studio I had single
pane window glass. The sulphur fumes were pretty bad coming from the clay I
was using at the time. So I would always fire at night to avoid them. The
air was blue in the studio. Being a "once in a while" housekeeper, thought
I would wash my windows. They wouldn't wash. They were etched to frosted
glass. My intuitive mind then said the sulphur must have turned into
sulphuric acid when it came in contact with the moisture on the cold windows
and etched them. What happens when that sulphur gets into your damp
lungs??? That is my take on this so avoid being in the same room. Luckily
I have a strong exhaust fan, but still try to avoid being in the studio.
Bonnie Staffel in Charlevoix where a winter storm warning is on and I can't
get to the studio. Good time to play catch up on Clayart.
______________________________________________________________________________
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
Snail Scott on thu 7 dec 00
Bonnie-
Philip Poburka is correct. The fluorine which is present
in many clay bodies from fluorspar is fluxing your windows
just as it fluxes your clay and glazes, by replacing the
oxygen in the silicate structute of the glass/glaze.
Sulfur isn't really part of the window-etching process,
although your kiln is almost certainly emitting sulfur
fumes too.
Hamer & Hamer confirm your observation of visible vapors,
and also the window-etching phenomenon.
-Snail
At 06:32 PM 12/6/00 -0500, you wrote:
>------Original Message------
>From: Bonnie Staffel
>To: CLAYART@LSV.CERAMICS.ORG
>Sent: December 6, 2000 5:34:47 PM GMT
>Subject: Re: how bad is it???
>
>
>I could pass on an example of how bad it is. In my old studio I had single
>pane window glass. The sulphur fumes were pretty bad coming from the clay I
>was using at the time. So I would always fire at night to avoid them. The
>air was blue in the studio. Being a "once in a while" housekeeper, thought
>I would wash my windows. They wouldn't wash. They were etched to frosted
>glass. My intuitive mind then said the sulphur must have turned into
>sulphuric acid when it came in contact with the moisture on the cold windows
>and etched them. What happens when that sulphur gets into your damp
>lungs??? That is my take on this so avoid being in the same room. Luckily
>I have a strong exhaust fan, but still try to avoid being in the studio.
>
>Bonnie Staffel in Charlevoix where a winter storm warning is on and I can't
>get to the studio. Good time to play catch up on Clayart.
>
| |
|
