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Iridescent glass

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No Body

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Aug 5, 2009, 2:31:53 PM8/5/09
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Does anyone know how the iridescent coating on stained glass is
made, and what the stuff is made of? I'm wondering how to remove
select areas on a piece.


Lauri Levanto

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Aug 5, 2009, 2:41:34 PM8/5/09
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I do not know the formula.
In principle it is a thin deposit of metal,

It can be removed by sandblasting, etching or abrasive tools.
-lauri

charlie

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Aug 5, 2009, 3:00:34 PM8/5/09
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"No Body" <som...@microsoft.orgy> wrote in message
news:Bekem.63575$O23....@newsfe11.iad...

> Does anyone know how the iridescent coating on stained glass is made,
> and what the stuff is made of? I'm wondering how to remove select areas on
> a piece.

different manufacturers use different chemicals. a bunch of them use tin
chloride fumed on when the glass is coming out of the rollers and still hot.


No Body

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Aug 5, 2009, 10:39:24 PM8/5/09
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"charlie" <chan...@nospam.yahoo.com> wrote in message
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Since I have it about, what sayest thou to brushing on etching
paste, aka hydroflouric acid?

Lauri Levanto

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Aug 6, 2009, 1:52:29 AM8/6/09
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It should work but
Be extremely carefull, read the safert notesand MSDS first.
It is dangerous stuff.
As always test on a scrap first
-lauri

Dennis Brady

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Aug 10, 2009, 10:11:28 AM8/10/09
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The irid surface can easily and safely be removed with sandblasting or
etching cream. If you want, you can return a full smooth gloss to the
etched parts by fire polishing in a kiln. Pieces done that way can
look delicately elegant.

Dennis Brady

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Aug 10, 2009, 10:14:26 AM8/10/09
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On Aug 5, 7:39 pm, "No Body" <some...@microsoft.orgy> wrote:
> "charlie" <chania...@nospam.yahoo.com> wrote in message
>
> news:h5clb6$adp$1...@news.eternal-september.org...
>
> > "No Body" <some...@microsoft.orgy> wrote in message

> >news:Bekem.63575$O23....@newsfe11.iad...
> >>    Does anyone know how the iridescent coating on stained glass is
> >> made, and what the stuff is made of? I'm wondering how to remove
> >> select areas on a piece.
>
> > different manufacturers use different chemicals. a bunch of them use
> > tin chloride fumed on when the glass is coming out of the rollers
> > and still hot.
>
>     Since I have it about, what sayest thou to brushing on etching
> paste, aka hydroflouric acid?

HFC is truly horrific stuff but the amount contained in Etching Creme
is too little to be of serious concern. It's commonly used by
thousands of hobbyists.

For anyone considering using HFC, here's an article explaining why
they should reconsider.
http://www.glasscampus.com/tutorials/pdf/Hydrofluoric%20Acid.pdf

No Body

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Aug 10, 2009, 2:32:59 PM8/10/09
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"Dennis Brady" <victoria...@gmail.com> wrote in message
news:29dec458-81b9-411c...@2g2000prl.googlegroups.com...


Thank you! That is very good to know!


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