Always learning. Sometimes info flies over my head but can go in my ears striking the bean at a later time.
Here’s a FB post from my Master Potter who is is always learning and thankfully always teaching 🙏🏽
“A reduction firing is normally done in a fuel burning kiln like gas or wood. Reduction firing is to reduce the oxygen in the kiln by decreasing the amount of air allowed in. This can than reduce the oxygen in the glazes and components of the pot like iron oxide becoming iron (over simplified concept warning) basically the environment in the kiln is ready for chemical reactions because of the temperature. When there is fuel starving of oxygen it will hunt it out and take it from sources that make it available. Some glazes like carbon trap shinos rely on a layer of carbon being deposited on a not yet melted sodium layer. As the sodium melts it traps the carbon. Reduction is required for that to happen.
Oxidation firing can be done in gas but is most common in electric kilns and just happens as you fire.”