Tony Hansen on wed 4 aug 99
I appreciate the comment on this, I am often guilty of this.
Believe it or not I have not missed one day of clayart in two years,
I always read it but don't post as much as I should.
"I got this request:
I am looking for a supplier of a glaze I recently encountered.
It is black at room temperature, but becomes clear when heated.
I saw it on a coffee cup that has a message that
appears when the hot coffee is poured in."
Anyone know anything about this?
--
T o n y H a n s e n thansen@digitalfire.com
Don't fight the dragon alone http://digitalfire.com
Calculation/Database Software for Ceramic Industry
Gavin Stairs on wed 4 aug 99
At 11:18 AM 04/08/99 , you wrote:
>----------------------------Original message----------------------------
>I appreciate the comment on this, I am often guilty of this.
>Believe it or not I have not missed one day of clayart in two years,
>I always read it but don't post as much as I should.
>
>"I got this request:
>I am looking for a supplier of a glaze I recently encountered.
>It is black at room temperature, but becomes clear when heated.
>I saw it on a coffee cup that has a message that
>appears when the hot coffee is poured in."
I don't think this is a glaze, Tony. I think it's a lacquer with
micro-encapsulated liquid crystals that are heat sensitive. I don't have a
source, but a search for heat sensitive lacquer or paint should produce one
or two.
Gavin
Tom Wirt on sat 7 aug 99
----- Original Message -----
From: Gavin Stairs
> >----------------------------Original message----------------------------
> >I appreciate the comment on this, I am often guilty of this.
> >Believe it or not I have not missed one day of clayart in two years,
> >I always read it but don't post as much as I should.
> >
> >"I got this request:
> >I am looking for a supplier of a glaze I recently encountered.
> >It is black at room temperature, but becomes clear when heated.
> >I saw it on a coffee cup that has a message that
> >appears when the hot coffee is poured in."
>
>
> I don't think this is a glaze, Tony. I think it's a lacquer with
> micro-encapsulated liquid crystals that are heat sensitive. I don't have
a
> source, but a search for heat sensitive lacquer or paint should produce
one
> or two.
>
> Gavin
>From what I know of this (ancient information) the colorchanging stuff is an
emulsion derived from fish oils. The changing temp can be controlled. For
silk screening the stuff used to be in the thousands of dollars per gallon.
We did a t-shirt printed with it. Since it is an organic compound, it would
burn off in a kiln. Gavin is right o suggest it has to be screened on after
the firing. We have a couple of "Phantom of the Opera" mugs that do this.
Tom Wirt
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