When heated copper carbonate will decompose to form black copper (II) oxide under oxidising conditions, or red copper (I) oxide and metallic copper when reduced. Commercial glazes contain fluxes that allow the copper carbonate to melt at a lower temperature.
Chromium Oxide Powder Cr2O3 will give you that park bench green in oxidation and reduction. I would add some Borax and Lithium Oxide, or Gerstley Borate into it to help flux it, to prevent it from smudging after the firing.
But doesn't copper carbonate make a green or blue glaze? Which I suppose in this case is different from paint - I wonder if the firing range has something to do with it.
The temp is much lower than you would reach when glazing and the atmosphere is also very different. I have never worked with glaze so I really have no idea about glaze recipes.
Can you paint a pot using ochre? Yellow, red, green, blue. Is it possible to paint the pots after they have been fired using the ochre? I know that the people did use hematite to paint the pots locally like how tony soares does but that is pre fired. I have no experience with painting them at all, I have not worked with ocre or hematite. I am curious because I am starting to make earth ware pots, bowls, pipes etc, and was thinking about how you can paint them in different colors using natural pigments. I’ve never seen a blue or green pot and I know why now. But I do think it is possible, using the ochre.
Is Miro Mora on your list of potters whom you plan on interviewing? I suspect not as his slips are not natural material but me not asking its a guarantee no. Very informative video. Thanks for sharing.
Hi , i really like your content its very inspiring, i wanted to ask you if you recommend any mineralogy or geology books that helps with clay knowledge and glaze chemistry, thank u
Unfortunately no. My knowledge came from talking to other people of from years of trial and error, I didn't;'t learn this from any book. You might enjoy my online masterclass called "Natural Pottery Paints, Slips & Pigments" which provides a lot of information on the subject of paints and slips. As for glaze chemistry, I never use glazes so have nothing to teach on that subject.
Using copper scares me. When super heated (like when firing) it gives of arsenic which is poisonous. So I wonder if your preparation has the same issue?
Perhaps but how would you be getting it in your system? Licking the paint? I don't think so, the other ingredient is manganese which is also toxic. Breathing the fumes of the firing? That fire is hot, keep your distance. Really lots of things are toxic, gasoline is toxic, yet I use it every day, I just don't ingest it.
I use copper to make beautiful greens. Either Cu sulfur or Cu oxide. When i use manganese, i get very metalic glass like surfaces, i wonder why yours look matte. (Oxidative kiln, even without transparent glaze mixture)
@@AncientPottery oh, i never thought that copper wouldn't be as green if it didn't reach high temp. I go for 1260c. Very inspiring videos you make! Been hunting for wild clay since i watched your stuff
Some years back, they found clues to the very durable Mayan blue to consist of attapulgite clay and copal. But it has still not been recreated since. I marvel at the enterprise of ancient tribal folks. Also, attapulgite isnt locally available for me, and I am guessing where you are either.
Most of the older Middle Eastern pottery is blue due to cobalt ore, which was abundant in Persia (now Iran). It was traded on the Silk Road. Cobalt is why we have exquisite blue and white Chinese porcelain. And yes, glazing involves many physical and chemical reactions (along with higher temps) that would take a short book (or a long one) to explain just the basics. I admire your dedication, Andy. You are living proof of the adage "do what you love." Bravo.
![ARGENTINA vs. BOLIVIA [6-0] | RESUMEN | ELIMINATORIAS SUDAMERICANAS | FECHA 10](http://i.ytimg.com/vi/C3wPtKNbAOA/mqdefault.jpg)
![BRASIL vs. PERÚ [4-0] | RESUMEN | ELIMINATORIAS SUDAMERICANAS | FECHA 10](http://i.ytimg.com/vi/tbyOJKXfQnI/mqdefault.jpg)
I love the way that black paint haloed on the cylinder Choco pot. Happy accident. Great video, thanks Andy for the consistent and interesting media.
You're welcome. Definitely a happy accident, I could re-fire but I think it looks pretty cool.
Thanks for the info Andy
Any time!
When heated copper carbonate will decompose to form black copper (II) oxide under oxidising conditions, or red copper (I) oxide and metallic copper when reduced. Commercial glazes contain fluxes that allow the copper carbonate to melt at a lower temperature.
Cool, thanks for the scoop.
Chromium Oxide Powder Cr2O3 will give you that park bench green in oxidation and reduction. I would add some Borax and Lithium Oxide, or Gerstley Borate into it to help flux it, to prevent it from smudging after the firing.
That's helpful info. Of course I try to collect all my ingredients from nature and there aren't any chromium mines around here.
Good explanation, thanks.
Thanks Wes.
Cool Chaco cylinder I would love to have a recreation in my living room
This one is for sale.
But doesn't copper carbonate make a green or blue glaze? Which I suppose in this case is different from paint - I wonder if the firing range has something to do with it.
The temp is much lower than you would reach when glazing and the atmosphere is also very different. I have never worked with glaze so I really have no idea about glaze recipes.
i got some green results by mixing metallic copper powder with clear glaze
Well glazing is a whole different story.
Can you paint a pot using ochre? Yellow, red, green, blue. Is it possible to paint the pots after they have been fired using the ochre? I know that the people did use hematite to paint the pots locally like how tony soares does but that is pre fired. I have no experience with painting them at all, I have not worked with ocre or hematite. I am curious because I am starting to make earth ware pots, bowls, pipes etc, and was thinking about how you can paint them in different colors using natural pigments. I’ve never seen a blue or green pot and I know why now. But I do think it is possible, using the ochre.
You need to add at least a third clay to the ochre to make it harden in the fire.
@@AncientPottery thank you. Love your videos! Keep it up.
Is Miro Mora on your list of potters whom you plan on interviewing? I suspect not as his slips are not natural material but me not asking its a guarantee no. Very informative video. Thanks for sharing.
I have no idea who “Miro Mora” is. But I am talking with “Pilo Mora” right now about a video.
@@AncientPottery no wonder I had such a hard time finding any information on this person on Google.
@@1a1u0g9t4s2u he’s a great potter and a nice guy, the problem is that he doesn’t speak English and I don’t speak Spanish
Thanks for sharing God Bless
Thank you too
Hi , i really like your content its very inspiring, i wanted to ask you if you recommend any mineralogy or geology books that helps with clay knowledge and glaze chemistry, thank u
Unfortunately no. My knowledge came from talking to other people of from years of trial and error, I didn't;'t learn this from any book. You might enjoy my online masterclass called "Natural Pottery Paints, Slips & Pigments" which provides a lot of information on the subject of paints and slips. As for glaze chemistry, I never use glazes so have nothing to teach on that subject.
Using copper scares me. When super heated (like when firing) it gives of arsenic which is poisonous. So I wonder if your preparation has the same issue?
Yeah let’s not go full Victorian.
Perhaps but how would you be getting it in your system? Licking the paint? I don't think so, the other ingredient is manganese which is also toxic. Breathing the fumes of the firing? That fire is hot, keep your distance. Really lots of things are toxic, gasoline is toxic, yet I use it every day, I just don't ingest it.
Why would copper give off arsenic? They are both separate elements.
I use copper to make beautiful greens. Either Cu sulfur or Cu oxide. When i use manganese, i get very metalic glass like surfaces, i wonder why yours look matte. (Oxidative kiln, even without transparent glaze mixture)
Probably temperature. I fire in an open, outdoor fire, my top temperature is usually no more than 850 C.
@@AncientPottery oh, i never thought that copper wouldn't be as green if it didn't reach high temp. I go for 1260c. Very inspiring videos you make! Been hunting for wild clay since i watched your stuff
What about lapis lazuli? Or ground up turquoise? There are lots of blue minerals.
Lapis does not exist around here so I have no idea. Turquoise and other copper minerals make a black paint after firing.
Some years back, they found clues to the very durable Mayan blue to consist of attapulgite clay and copal. But it has still not been recreated since. I marvel at the enterprise of ancient tribal folks. Also, attapulgite isnt locally available for me, and I am guessing where you are either.
No it isn't. I have seen ancient blue ceramics from the middle east too. So I assume there are minerals that will do it some places in the world.
Most of the older Middle Eastern pottery is blue due to cobalt ore, which was abundant in Persia (now Iran). It was traded on the Silk Road. Cobalt is why we have exquisite blue and white Chinese porcelain. And yes, glazing involves many physical and chemical reactions (along with higher temps) that would take a short book (or a long one) to explain just the basics. I admire your dedication, Andy. You are living proof of the adage "do what you love." Bravo.
What about Ancient Egyptian Pottery they used Blue very Often , how?
Yes, also in Mesopotamia but I don't think we have access to the same minerals here in the American Southwest as they had.
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