Jian ware, Tenmoku/oil spot
Apr 1, 2018 10:00:57 GMT -6
Post by gczop on Apr 1, 2018 10:00:57 GMT -6
Here is a study that reveals that the oil spot is a surface grouping of epsilon-Fe2O3.
www.nature.com/articles/srep04941
and a short video www.youtube.com/watch?v=QN1oey6J9PA&feature=youtu.be
Another scientific study analysis of 23 shard samples gives an average composition of about 3 K2O, 6CaO, 3 MgO , 19 Al2O3 , 66 SiO2 plus less than 1 each of Na2O, MnO, TiO2 and phosphate all percent plus add 6% red FeOx to this base.
Glaze can be prepared using red art clay or plastic vitrox with adds of whiting and magnesite/ talc to get the important % 6CaO, 3 MgO (also a bit more red FeOx). Must go on thick greater than 1g dry glaze/sq. inch. Prefers a cover glaze , I use 80 feldspar, 10 talc and 10 wollastonite with 8% red FeOx.
Fire cone 9-11.
There are dozens of recipes out there, but the Jian glaze in different thickness, firing temperature and atmosphere apparently will produce many of the variations: Nigel Wood Chinese Glazes. (I'll post some from the kiln here at some point)
Cheers G.
www.nature.com/articles/srep04941
and a short video www.youtube.com/watch?v=QN1oey6J9PA&feature=youtu.be
Another scientific study analysis of 23 shard samples gives an average composition of about 3 K2O, 6CaO, 3 MgO , 19 Al2O3 , 66 SiO2 plus less than 1 each of Na2O, MnO, TiO2 and phosphate all percent plus add 6% red FeOx to this base.
Glaze can be prepared using red art clay or plastic vitrox with adds of whiting and magnesite/ talc to get the important % 6CaO, 3 MgO (also a bit more red FeOx). Must go on thick greater than 1g dry glaze/sq. inch. Prefers a cover glaze , I use 80 feldspar, 10 talc and 10 wollastonite with 8% red FeOx.
Fire cone 9-11.
There are dozens of recipes out there, but the Jian glaze in different thickness, firing temperature and atmosphere apparently will produce many of the variations: Nigel Wood Chinese Glazes. (I'll post some from the kiln here at some point)
Cheers G.
