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PeterH

Member Since 28 Apr 2013
Online Last Active Today, 06:27 AM
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Posts I've Made

In Topic: What Causes Glaze/clay 'tide Mark'?

02 March 2015 - 08:18 AM

That looks like the colour of the clay body to me. Are you sure it is white stoneware? What colour is it on the bottom?

 

White.

 


Attached File  _vase_bottom_5cm.jpg   29.08KB   0 downloads

 

 

PS Note that the tide-mark at the bottom edge is not very pronounced.


In Topic: What Causes Glaze/clay 'tide Mark'?

02 March 2015 - 06:42 AM

I bought a pot in Cornwall a few decades ago, which appears to have a dolomite glaze over white stoneware body.

Interestingly it seems to have not a tide-mark but significant areas of the browny-orange.

Attached File  _vase_cropped_10cm.jpg   101.28KB   0 downloads

 

Looked at more closely the areas appear speckled but free from edge-effects.

Attached File  _vase_detail_10cm.jpg   47.94KB   0 downloads

 

Any ideas what's happening? I go along with the solubles/volatiles theory for the

previously described tide-marks. Perhaps the pot was dipped and finger-wiped,

distributing the solubles uniformly over a significant [unglazed] area?

 

PS Chris your example seems to show both tide-marks and more solid areas. Would

you like to comment on any differences in treatment?

http://community.cer...ark/#entry76296


In Topic: Rehydrating Old Glazes

01 March 2015 - 05:32 PM

Just to reference John Britt's comments on crystals developing in glaze buckets,

presumably on cooling. http://www.ceramicst...lambe_magic.htm


In Topic: Anyone Familiar With Bob Shay's Glaze Recipes?

01 March 2015 - 05:27 PM

https://glazestuff.w...ku-chris-busse/

... gives a similar recipe for a Raku glaze (I haven't re-expressed as % to check)

Flame Drops:

 

very cool, will flash reds and oranges

Magnesium Carb 30.8
Lithium Carb 15.4
Gerstley Borate 53.8
Copper Carb 4.6
Chrome Ox 0.3

... presumably raku with post-fire reduction to get the flashing.

 

PS The high levels of lithium & GB in Earthmother & Superstition, coupled with the possibility of raku brings

Rick’s Turquoise to mind (don't know if this is just a flight of fancy). I presume that they must be turquoise in

oxidation. Reputedly Rick's Turquoise gives all sorts of nice colours in post-fire reduction, but not so far for me.

https://glazestuff.w...-mimi-champlin/

https://www.google.c...ick’s Turquoise

 

 


In Topic: Crumb Management

25 February 2015 - 10:44 PM

I work at a desk and try to keep them on the desk top

 

Would a potting tray on the desk help, perhaps with a terrycloth towel inside?

 

http://www.stewart-g...tting-tray.html