Stone Mountain Clay & Glaze Co.

4744F North Royal Atlanta Drive
Tucker, GA  30084
PHONE (770) 986-9011 / FAX (404) 492-7190
Yes, we are open to the public! 

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333 Black Raven Stnwr.

333 Black Raven Stoneware is a clay that has no equal. Black Raven is jet black in color, when fired to Cone 6, and is ideal for dinnerware and other functional pieces. 333 is very user-friendly on the wheel, and handbuilds very well (taking attachments without difficulty). Black Raven textures and alters nicely, it provides a great surface for carving or stamping. 333 vitrifies (becomes water-tight) at Cone 6, and should only be fired to Cone 6 oxidation (never in reduction). We strongly recommend a Cone 04 bisque-firing with the Black Raven Stoneware. Unlike many other "black clays," Black Raven is a true stoneware, and can be used for functional as well as decorative work. When fired properly it can be used in the oven, dishwasher and microwave. It's gorgeous color is not created with stains (so it will not be true black until fired to cone 6), and the Black Raven contains less than 1% Manganese Dioxide.

The key to success with 333 Black Raven Stoneware and 335 Onyx Krunch Stoneware is a slow firing to a straight cone 6. Firing too quickly, or firing too cool during the bisque can cause problems during the glaze firing (bloats and blisters). DO NOT reach cone 6 and hold temperature for any length of time. This increases the heat in the clay and can cause blisters and bloats. If you are using a programmable kiln, we recommend the slow bisque setting to cone 04 and the slow glaze setting to cone 6. All of our stonewares can be fired with the same program, at the same time, as the black stonewares. Follow those programs, or our firing chart for sitter/timer kilns, and you will experience the best performance from these gorgeous clays!

Attention Skutt Kiln users: If you have a newer model Skutt, that does NOT feature the Bartlett V6-CF controller, you may experience some bloating with Black Raven and other dark or speckled stonewares when using the slow program. Their newer kilns feature a controller that does not let you select between a bisque and a glaze profile, and therefor does not fire quite the same as other computerized kilns.  This may not impact your firing with lighter-colored bodies, but it often does with darker bodies. Their slow profile for cone 6 unfortunately fires almost twice as long as other controllers.

If you have this newer controller, we recommend that you continue to use the slow cone 04 profile for bisque in your Skutt, and test firing with the MEDIUM cone 6 program for glaze. This has proved very successful for many of our customers. The other option is to download and use the slow bisque and slow glaze firing profiles from the Bartlett website here:

With a typical slow firing, your bisque should last approximately 10-12 hours, and glaze firing should last approximately 7-9 hours. If you are experiencing odd firing results or noting times that are drastically different from these recommendations - please call us so that we can help figure out what's happening with your firing, and ensure the best possible results.

Its jet black color typically alters a glaze's fired color, sometimes drastically. We can make many glazing recommendations, and always recommend you make test samples when using Black Raven with new colors. 333 is wonderful to use with slips, such as porcelain or red, as it can create a striking glaze contrast within your design. Not comfortable selecting glazes for the 333 Black Raven? Check our our "Black-Tie Affair" glaze sample pack, featuring ideal glazes for this dynamic clay body.

Did you know...333 Black Raven Stoneware is fantastic for marbling. Create one-of-a-kind pots by combining it with any of the following clay bodies: 216 Tan Speck Stoneware, 246 Speckled Brick Stoneware, 262 Grey Speck Stoneware, 327 Great White Stoneware, 328 Big Red Stoneware or 340 Spotted Owl Stoneware.

Did you know...Black Raven makes an exceptional decorating slip (we even make it this way!). When used on our other stonewares, it can create a strong contrast in your glazing and overall design. When used as a decorating slip, Black Raven can be fired up to Cone 10 in oxidation, reduction or salt. Let us save you a step, click here to check out our Black Raven slip-ready to use!

Did you know...Using a clear Cone 6 glaze on the Black Raven will not give you a shiny black pot, instead your piece will be shiny brownish-green. If you wish to achieve a glossy black finish, we recommend a thin coat of our #407 Buttered Popcorn glaze.

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