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White glaze turning yellow

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I hope this isn't bad manners but I've just realised this would be better posted in the Clay and Glaze Technical forum but I can't see how to delete this post, so now it's double posted, apologies!





Please help


I have a white glaze that randomly turns yellow.


I can use the same glaze for a whole kiln full of work and some pieces turn out snow white while their neighbour is totally toxic yellow.


The recipe is:


Potash Feldspar 33

Talc 21

Quartz 16

China Clay 15

Whiting 12

Zinc 3

+ Titanium dixide 3

Tin Oxide


On earthstone ES160 special clay


I fire to cone 9 in an electric kiln with a ventsure extraction system. I bisc to cone 06 - if that information can be of any help?


My own theories have been:


Contamination from chrome fumes? but it still happens even when there's not chrome in the kiln. The other glazes I use are iron or copper based.


Patches of reduction? but it happens to one pot and not it's neighbour some times and in relatively empty kilns some times too. It also happens in different areas of the kiln.


I'm not ruling out thickness of application either but it's not the clay showing through it's a sort of bright toxic yellow fog in the glaze, it's also not as shiny as the white.


Help/ideas/theories/general musings welcome

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