All of the following black glaze recipes and more can now be found on my new open-source ceramics recipes website, Glazy: https://glazy.org/search?base_type=460&type=880&cone=high
Here are a few black glazes, mostly from John Britt’s book High Fire Glazes.
Val’s Satin Black
From Val Cushing.
- Custer Feldspar: 20
- Soda Feldspar: 20
- Whiting: 2
- Silica: 20
- Ball Clay: 10
- Talc: 13
- Dolomite: 15
- Add: Red Iron Oxide: 3
- Add: Manganese Dioxide: 2
- Add: Cobalt Oxide: 3
- Add: Chrome Oxide: 1
Porcelain, Orton Cone 10 Reduction 
Stoneware, Orton Cone 10 Reduction
Val’s Satin Black Variation
From Ceramic Arts Daily:
- Custer Feldspar: 20
- Soda Feldspar: 20
- Whiting: 2
- Silica: 20
- Ball Clay: 10
- Talc: 13
- Dolomite: 15
- Add: Red Iron Oxide: 9
- Add: Cobalt Carbonate: 3
Porcelain, Orton Cone 10 Reduction 
Stoneware, Orton Cone 10 Reduction
Fat Black
From The Complete Guide to High-Fire Glazes:
- Custer Feldspar: 32.7
- Whiting: 15.4
- Silica: 32.7
- Kaolin: 9.6
- Ball Clay: 9.6
- Add: Red Iron Oxide: 8
- Add: Cobalt Carbonate: 3.8
- Add: Bentonite: 2
Porcelain, Orton Cone 10 Reduction 
Stoneware, Orton Cone 10 Reduction