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ayjay

Lighten A Glaze?

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I mixed a glaze; I quite like it as it is for some things, but in general terms it's definitely a little darker than I would like when it's been fired.

 

Is there a tried and trusted method to make it lighter?

 

Options I've considered so far (in order of what I expect to be the most effective) include mixing a further batch of the base with no colourants and adding that to the original mix or just adding some Tin Oxide or some Titanium Dioxide.

 

 If it helps, the colourants involved are RIO @1% and Iron Oxide Yellow  (so, more RIO  :rolleyes: )  @3% .

 

Any suggestions?

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 Reducing the iron content,  cheaper by far than increasing tin and titanium.

Adding a further batch with no colourants may end you up with a bigger bucket of glaze that you're not that happy with because that would be, no mathematician here, a big reduction in all colourants. Ah it's a testing time this pottery!

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putting it over a white clay body or white slip will lighten it up too.  

 

tin and titanium will definitely lighten it up, but there are many others that don't cost as much.  the only issue i could see with using an opacifier is that there is a chance your actual glaze texture may change depending on how much you add, since opacifiers can sometimes make the glaze go toward matte.

 

what's the quantity of glaze you're trying to alter?

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I already use a white body, and this is a fairly matt glaze, being more matt would be fine.

 

It's only a small quantity, 1000gms dry, (i don't produce enough to make gallons of glaze).

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May want to do a series of rates of 'dilution" of "colourless" batch to existing batch to get the lightness you're after, then work back mathematically to mix up future batches of  the glaze you're happy with.

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Thanks everyone.

 

I shall mix a full size batch and start by adding 50% of that to the original - once I've get it right any leftovers will have a complementary colour added and I'll have two glazes which I know will definitely play nicely together. B)

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