Metal Glaze fired at 1260degree Celsius

[HDC]

Hello, everyone this is my first time for post the topic. Please help advise.

If I use manganese 20% + copper oxide 20% into base transparent glaze(with out lead) and brush outside of mug only for decoration. My questions is...

1.  This metal glaze is food safe or not? I fired at 1260 degree celsius.

2.  If not, if I use only outside of mug only for decoration... would it be safe?

3. How can I use metal glaze which is be safe for food? (meant other oxide or receipt?)

4. If I use Ferric as over oxide instead, is it work?

Thank you very much.

 

[shiyu huang]

all kind of metal glaze is  unsafe for food , it may be safe for use in outside

[Babs]

that's a lot of metal!

could use it nowhere near glaze but def. Not on inside.

.33 black copper: .66 many will give a bronze effect on own

tests are the way to go

not food safe

[HDC]

Thank you very much for your advise.

i will use it only on outside and may use ferric instead.

[Min]

What colour are you trying to get?

[HDC]

Dear Min,

As enclosed, I would like to get brown glossy which is shown light brown when slightly brush and sparkle spotted shown when thicker brush layer. Do you have any suggestion?

[Min]

Years ago I did some brushwork with 50 Blackbird and 50 frit 3124 on top of a clear glaze, similar looking.   Doesn't need to be thick but if you have those ingredients it might be worth a try.

[Mark C.]

On 4/9/2018 at 8:08 PM, HDC said:

Hello, everyone this is my first time for post the topic. Please help advise.

If I use manganese 20% + copper oxide 20% into base transparent glaze(with out lead) and brush outside of mug only for decoration. My questions is...

1.  This metal glaze is food safe or not? I fired at 1260 degree celsius.

2.  If not, if I use only outside of mug only for decoration... would it be safe?

3. How can I use metal glaze which is be safe for food? (meant other oxide or receipt?)

4. If I use Ferric as over oxide instead, is it work?

Thank you very much.

 

Tom Colemans high manganese glaze is food safe -he had it tested as he sold it to a large dinnerware company who did a though workup on its safety .Its was also a cone 10 glaze

It has no copper in it. I would approach your color problem with mason stains as Min suggested.

[HDC]

@Min Thank you very much for your advise. Blackbird, do you mean for clay? like this link or not? http://www.theceramicshop.com/product/120/BlackBird-Clay-Barnard-Clay/ i cannot find mason stains call blackbird.

@Mark C. Thank you very much.  I am testing by put lime on it,  just try to see what going on.

[Min]

3 hours ago, HDC said:

@Min Thank you very much for your advise. Blackbird, do you mean for clay? like this link or not? http://www.theceramicshop.com/product/120/BlackBird-Clay-Barnard-Clay/ i cannot find mason stains call blackbird.

Yes. Exactly what you linked.

[HDC]

thank you very much