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Glaze finishes

Saturday, March 28, 2009

Glaze firing

I've been producing to stock, ready for the fingers-crossed Plan A at Royal William Yard. ...more meetings still to happen before it's decision time!

So this week I have mostly been firing the pots I threw and prepared earlier. Here are three about to come out of the kiln / furnace. The one at top right has been prepared with a slip-resist.

In this second shot you can see the slip resist peeling away from the front surface. That's ok and is actually part of the design. Using a slip-resist technique can give great texture, colour and pattern.

So what's all the wood shavings about? This pot (below) is destined for a lustre finish and for this type of glaze manipulation you need what's called a "reducing" atmosphere (also applies to the slip-resist technique mentioned above).

This simply means that the atmosphere in which the pot sits is starved of oxygen. The only available oxygen comes from the glaze itself (metal oxides always form the base for coloured glazes) and when a metal oxide has some of its oxygen nicked it can give a huge variation in the colour you get when plenty of oxygen is around.

And the smoke from the wood gets to the areas I've left unglazed to give a nice overall patina finish.
Next post will be photos of the finished product - when I can get the hang of doing my blog all by myself!


S.O.Z said...

Hi Mansour,

I'm curious to know what kind of glaze would you need to achieve a high metallic finish similar to polished stainless steel.

I'm trying use polymer clay to make jewelery. I saw documentary about the teapottery company and how the used a glaze to mimic a high metal finish for some of their quirky tea pots. Been searching intensely but to no avail.

Thanks in advance.

Mansour Eskandary said...

The way that the folks on the documentary achieved it was likely by using a transparant glaze, firing then painting on a specialist metallic glaze and firing again. These metallic glazes can be got from most specialist pottery suppliers such as:
Pot Clay Ltd and Pottery Craft Ltd in the UK.

I don't use pre-made glazes to achieve a metallic finish, instead I mix my own glaze recipe to suit the type of clay and the firing temperature and charecteristics.

Hope this helps, if you've got any questions, just drop them off here.

Good luck with the jewellery, Mans

Steve (My Dog Ate Art) said...

Hi there - might pop in to say hello next time i'm in town

Mansour Eskandary said...

Hi there Steve, good to hear from you. You're more than welcome to pop in and say hello. Give me a shout first so I can make sure I'm there.
mobile 07525 349125

Cheers mate

Steve (My Dog Ate Art) said...

Still intending to pop in - I haven't forgotten - hope things are okay with you


Tatiana said...

Love these photos! exciting!

Anonymous said...

I wonder how the finished products would look like.. Nice post. :)

Crystal @ Plush Palate said...

Love the moment the last image captured with the fire!

Mansour Eskandary said...

tanx 4 ur comments. sorry if Im 2 slow. bin buzy making some pots, as u c in my recent posting