[Clayart] Chinese "raku"

Paul Gerhold gerholdclay at gmail.com
Thu Jul 4 21:48:07 EDT 2019


I just think the work is amazing. Anyone know where it can be bought in the US?

Paul

> On Jul 4, 2019, at 5:12 PM, Robert Harris <robertgharris at gmail.com> wrote:
> 
> Hi Rob,
> 
> What is important to note on the oil spots is that it has to be in
> oxidation on the way up, or you don't get decomposition of the iron (to
> produce O2) at about 2200F or so - hence using an electric kiln. The
> production of Oxygen when the glaze is molten brings the iron particles to
> the surface.
> 
> This gives pretty ordinary oil spots (particularly brown in black). What is
> interesting is that you obviously get much brighter metallic oil spots if
> you reduce on the way down - which is what they were doing in the video.
> 
> It looked to me like the elements are SiC Glo-bars which are pretty common
> in industrial furnaces and don't have the same problems with reduction as
> metal elements.
> 
> My assumption on the other video with the water is that there is "water
> reduction" plus instant cooling to "fix" the colours of the oil spots.
> 
> Just off the top.of my head, I'd imagine that the blue oil spots are
> totally reduced iron that are also undergoing a process similar to the
> "blueing" of steel (there may be oil or something else mixed in with the
> water).
> 
> Robert.
> 
> 
> 
> 
> 
>> On Thu, Jul 4, 2019, 12:43 PM robert hackert <ndiaman at hotmail.com> wrote:
>> 
>> Hi Robert:
>> Pretty much what we saw in the first video. The kiln appears to be
>> electric, but doing reduction, so heavy duty elements. Oxy probe, and
>> pyrometer, so no hit and miss.
>> It did look to be an iron glaze.
>> Great video. Course they had 800 yrs., or more jump on everyone else.
>> 
>> Rob Hackert
>> 
>> Sent from my iPhone
>> 
>>> On Jul 4, 2019, at 6:56 AM, Robert Harris <robertgharris at gmail.com>
>> wrote:
>>> 
>>> I have to admit, I thought the water was coloured because it had absorbed
>>> stuff from the glaze (i.e. not stable very stable or so high in iron that
>>> the oxide was coming off into the water) vs being that colour originally.
>>> 
>>> I also thought that the point might be to "fix" the oil spots before they
>>> re-oxidised, or something similar.
>>> 
>>> On the topic of oil spots, I found this pretty interesting video a while
>>> back, might be worth sharing too.
>>> 
>>> 
>> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DN6Knf7H_FwY&data=02%7C01%7C%7C5cadc5e14fa84cb065cc08d7006e3fb0%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636978345817797821&sdata=ZfGGogXIHrBXvsbfewcGT0h9hn9uQH5srSh%2BM%2BP1MT0%3D&reserved=0
>>> 
>>> 
>>> 
>>> 
>>> 
>>>> On Wed, 3 Jul 2019 at 17:39, Douglas Fur <23drb50 at gmail.com> wrote:
>>>> 
>>>> Some of the water used in this process appears colored. I wonder if they
>>>> are using soluable metal salts to effect the glaze surface like fuming.
>>>> Some have posited that the water is for reduction. Maybe its both the
>> water
>>>> reducing the salts so that the result is a metallic luster.
>>>> Looks flash but I wonder how stable this surface would be. Would it
>> survive
>>>> a dishwasher, hand washing or hot acidic tea served in it?
>>>> Duff
>>>> Seola Creek
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