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why_not

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  1. The saggar has a tight seal to prevent carbon monoxide from escaping which both ensures strong reduction and protects the kiln elements but it prevents oxygen , from the atmosphere , from entering so a source of oxygen must be provided. The iron oxide is added to provide a source of oxygen to react with the carbon . Black iron oxide was chosen because, at temperatures around cone 6, it reacts easily with carbon to produce carbon monoxide. Black copper oxide could also be used as an oxygen source but it's more expensive. Black iron oxide is cheap, readily available and comes as a very fi
  2. I have recently carried some successful trials using saggars to produce cone 6 copper red reduction glazes in an electric kiln. I generated a reduction atmosphere by adding a small amount of black iron oxide mixed with powdered charcoal to the bottom of a saggar with a test piece painted with Selsor red copper reduction glaze (see formula in "The Complete Guide to Mid-range Glazes " by J. Britt pg 100). I started with a copper red cone 6 glaze because it is easy to see if there is reduction; red=reduction / green=no reduction. The iron oxide/ charcoal mixture reacted to produce a reducing c
  3. I have recently carried out some successful trials using saggars to produce cone 6 copper red reduction glazes in an electric kiln. I generated a reduction atmosphere by adding a small amount of black iron oxide mixed with powdered charcoal to the bottom of a saggar with a test piece painted with Selsor Red (formula see J. Britt - The Complete Guide to Mid-range Glazes pg 100). The iron oxide/charcoal mixture produced a reducing carbon monoxide atmosphere within the saggar during firing to cone 6 which turned the glaze oxblood red (see attached photo). The atmospere within the kiln remaine
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