tgschs10 on sun 19 nov 00
In respect to gold firings, many years ago I fired several pieces with good
results; then someone suggested firing to cone 08 yes 08; What occurs is
that some of the gold gasses off but what remains gives islands of brillant
gold with the underlying glaze showing through. Over a black, dark green or
white the result is spectacular. In our condominium, we have a black lacquer
bar; I made black gossy tiles and put gold over the top and fired to cone
08; it is beautiful. As a matter of fact, I just purchased several small
bottle of gold and plan to make some bowls decorated in a similar manner.
Believe me absolutely beautiful.
Tom Sawyer
tgschs10@msn.com
Gabrielle on sun 19 nov 00
A question for some of my fellow Raku artists. A while back, (long
enough that I can't remember) I fired a small Raku piece to test real
gold lines in reduction. Basically I was hoping to use real gold and
still get the "Raku" effects from reduction. When the piece came out
the gold was somewhat faded looking, and I assumed that I had
overheated and the overfiring temp. had begun to burn off the gold.
But, now I'm not sure. Could the effect of the gold from it's normal
brilliance to a somewhat silvery/purpley effect be because of taking
the piece from the kiln to the reduction bin?
Any thoughts, or knowledge that someone could share would be greatly
appreciated. ---
Sincerely,
gabrielle
mail@gabriellem@telus.net
Hank Murrow on sun 19 nov 00
Gabrielle wrote:
>A question for some of my fellow Raku artists. A while back, (long
>enough that I can't remember) I fired a small Raku piece to test real
>gold lines in reduction. Basically I was hoping to use real gold and
>still get the "Raku" effects from reduction. When the piece came out
>the gold was somewhat faded looking, and I assumed that I had
>overheated and the overfiring temp. had begun to burn off the gold.
>
>But, now I'm not sure. Could the effect of the gold from it's normal
>brilliance to a somewhat silvery/purpley effect be because of taking
>the piece from the kiln to the reduction bin?
Not likely, IMHO. More likely is that the surface of the glaze or clay was
not shiny enough to give its gloss to the gold. The gold layer is so thin
that the substrate must be glossy .
Good hunting! Hank in Eugene
Snail Scott on sun 19 nov 00
I've never rakued a gold luster overglaze, but reduction shouldn't
hurt it. It's my understanding that it actually reduces anyway in
a 'normal' firing, from the burnout of its oily base. Persian lusters,
too, rely on the burnout of the vehicle to produce the metallic
effects.
The effect you describe sounds like overfiring to me.
Perhaps you could do this: Fire your raku normally. (I don't know what
you normally fire to, but I'm guessing that glazes around ^012 or ^010
might work better than ^06.) After reducing and cooling , apply the gold
luster, then refire to ^018. Pull the work out and re-reduce it.
I don't actually know whether the first reduction would be lost, but
if you went up fast on the second firing, it might retain some. Also,
I don't know if ^018 is high enough to get good post-firing reduction,
but it _is_ red heat. If you're using copper glazes, the reduction will
be more important, of course. I've also heard that some copper-
bearing glazes can be inimical to metallic overglazes, though I've not
had that problem personally. (So, basically, I don't know much.)
Do post it to the list if you get results, positive or negative!
-Snail
At 02:53 AM 11/19/00 -0000, you wrote:
>A question for some of my fellow Raku artists. A while back, (long
>enough that I can't remember) I fired a small Raku piece to test real
>gold lines in reduction. Basically I was hoping to use real gold and
>still get the "Raku" effects from reduction. When the piece came out
>the gold was somewhat faded looking, and I assumed that I had
>overheated and the overfiring temp. had begun to burn off the gold.
>
>But, now I'm not sure. Could the effect of the gold from it's normal
>brilliance to a somewhat silvery/purpley effect be because of taking
>the piece from the kiln to the reduction bin?
>
>Any thoughts, or knowledge that someone could share would be greatly
>appreciated. ---
>Sincerely,
>gabrielle
>
>mail@gabriellem@telus.net
>
email@DOMAIN.COM on mon 20 nov 00
Gold can make a purple glaze. You could be seeing this. It also can become purple
if it is applied as a very thin coat as a luster. You can get this intentionally
by watering down the luster with thinner and putting on a transparent watercolor
like coat.
Louis
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