So I have a recipe that calls for the above.  Upon searching you come up with various answers, but the bottom line is that it is copper oxide.  What I really want to know is whether it is red, black or some other color.  I have both of those and also some blue copper sulphate as well as the ol' standby, copper carb.  So what is it?, Buehler, buehler.....?  jhp

Views: 275

Reply to This

Replies to This Discussion

It doesn't exist.   There's no such thing as Copper (VI) Oxide.  It's a typo.  There's such a thing as Cu2O3 (Copper (III) oxide), but I've never actually come across it at any pottery supply store. I think it's more likely that the recipe was calling for copper carb and the C dropped out.  

CuO3... yeah that would be some energetic compound. If it did exist, you probably would not want it in your studio.:-)

Keep in mind copper carbonate is not pure,  but a mix of 50% CuCO3 copper carbonate and 50% Cu(OH)2 copper hydroxide.

So the amount of  Black Copper Oxide  CuO  in each is the following:

111.18% Red Copper Oxide - Cu2O  takes on extra oxygen in the kiln
100.00% Black Copper Oxide - CuO
71.95% Copper Carbonate (actual 50% CuCO3 / 50% Cu(OH)2)
81.53% Copper Hydroxide - Cu(OH)2
64.38% Copper Carbonate - CuCO3  theoretical

Reply to Discussion



  • Add Videos
  • View All

Use These Links to Support Us

Low cost flat lapping disc can be used on you potters wheel if you, drill bat pin holes in it, and provide a trickle of water to cool it. At, 120 grit for aggressive material removal. Click the image to purchase 

Members have had great things to say about John Britt's new book, Mid-Range Glazes. Click the image to buy from

Purchase Glazes Cone 6 by Michael Bailey, The Potters Book of Glaze Recipes by Emmanuel Cooper, or Making Marks by Robin Hopper, all available at amazon.comMastering Cone 6 Glazes by John Hesselberth & Ron Roy is now out of print.

Harbor Freight is a great place to find unbeatable prices for better HVLP spray guns with stainless steel parts and serviceable economy models, as well as detail guns, all tested by our members for spraying glazes, as well as compressors to power the guns. As yet no one has tested and commented on the remarkably inexpensive air brushes at harbor freight.

The critter siphon gun is a spray alternative that is well liked by some of our members, and is available at amazon.

Amazon is also a competitive source for photo light tents for shooting professional quality pictures of your work. They also have the EZ Cube brand favored by several of our members. You might also want to purchase the book Photographing Arts, Crafts and Collectibles . . .

If you are up to creating videos of your work or techniques you might want to invest in a flip video camera

Following are a few scales useful for potters. Ohaus Triple Pro Mechanical Triple Beam Balance, 2610g x 0.1g, with Tare $169.00

And finally a low cost clone of the OHaus. The Adam Equipment TBB2610T Triple Beam Mechanical Balance With Tare Beam $99.62

ebay is a great alternative for many tools and the equipment used in the ceramics studio - kilns, wheels, extruders, slab rollers are often listed there both new and used.

Tips for Members

If you just want to spout off, it is best accomplished as a blog posting. If you want to get more guidance and ideas from other members, ask a question as a new discussion topic. In the upper right corner of the lists for both types of posting, you will find an "+Add " button. Clicking it will open an editor where you create your posting. 4/16/2014

© 2022   Created by Andrea Wolf.   Powered by

Badges  |  Report an Issue  |  Terms of Service