Barnard Blackbird Clay Substitute (SG758)
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You must test before you use it, at any scale. Raw materials, mined or man-made, are not consistent. Color, strength, particle size and chemistry can change from one bag to the next and from one supplier to another, even when the name on the bag stays the same. Before you use this material in a glaze, slip or clay body of any size, mix a small test batch, fire it on your own clay in your own kiln, and check the results.
BARNARD BLACKBIRD SUBSTITUTE SG758 10lb Bag
10 Pound Bag:Please call 888.774-2529 to order smaller or larger quantities of this Barnard clay substitute.
This is a blend of minerals that closely simulates Barnard (Blackbird) Clay, a widely used clay that contains iron and manganese.
| Typical analysis: | |
| SiO2 | 30.37% |
| Fe2O3 | 26.27% |
| Al2O3 | 20.52% |
| MnO | 8.72% |
| K2O | 1.68% |
| CaO | 0.59% |
| MgO | 1.07% |
| TiO2 | 1.06% |
| NaO | 0.52% |
| LOI | 8.85% |
This material was developed to mimic the effects of Barnard clay when used as a wash or when used in clay body formulations. Though it can be added to glazes as a substitute material, its effects may vary from the original.
Frequently Asked Questions
Usually it went on too thick. Manganese gives off gas as it heats, and a heavy coat traps it. Brush it on thin and wipe back the high spots. Fire with the kiln well vented, because manganese fumes are harmful to breathe.
Yes. A clear or pale glaze over it lets the dark color show in the low spots. Manganese can make the glaze run a little where the two meet, so test on a tile before you glaze your good pots.
Glaze and clay recipes go by weight, not by volume, and they don't count water. Each ingredient is a share of the dry total. 2% means 2 grams for every 100 grams of dry ingredients. For a 500-gram batch, that's 10 grams. Colors and opacifiers are often listed as extras on top of a recipe that adds up to 100, written like "+2" or "add 2%." Weigh those the same way: 2 grams for every 100 grams of the base recipe. A digital scale that reads to 0.1 gram makes small amounts easy.
A test tile is a small piece of the clay you use, glazed and fired just like your real work. Raw materials vary from bag to bag, and results also change with your clay, how thick you apply the glaze and how your kiln fires. A test tile is the only way to know what you'll get before you glaze a whole batch of pots. Write what's on each tile on the back (an underglaze pencil works), and keep notes so you can repeat what works.
Yes, whenever you handle the dry powder. Fine dust is the main hazard with most raw materials, and some can harm your lungs over time. Wear a NIOSH-approved respirator (N95 or better) while you weigh and mix. A basic dust mask that isn't N95-rated won't protect you. Once a material is mixed with water, dust is much less of a problem, but wipe up spills with a wet sponge before they dry, and mop instead of sweeping. Don't eat or drink while you work, and wash your hands afterward. Check each product's Safety section for anything extra that material needs.
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