Editing Raku ware (section)

==Raku reduction ==
[[File:Raku 15.06.2014 13-45-11.jpg|thumb|Raku ware in the reduction chamber]]
In the western style of raku firing, the [[aluminium]] container acts as a reduction chamber, which is a container that allows the carbon dioxide to pass through a small hole.<ref name="Knapp, Brian J 1998">source(Knapp, Brian J. Oxidation and Reduction. Port Melbourne, Vic.: Heinemann Library, 1998. Print.)</ref> A reduction atmosphere is created by closing the container.<ref name="Knapp, Brian J 1998" /> A reduction atmosphere induces a reaction between oxygen and the clay minerals, which affects{{vague|reason=affects in what way?|date=March 2015}} the color.<ref name="Birks, Tony 1982">source(Birks, Tony. The New Potter's Companion. Englewood Cliffs, N.J.: Prentice Hall, 1982. Print.)</ref> It also affects the metal elements of the glaze{{vague|reason=affects the metal elements in what way?|date=March 2015}}. Reduction is a decrease in oxidation number.<ref name="Birks, Tony 1982" /> Closing the can reduces the oxygen content after the combustible materials such as sawdust catch fire and forces the reaction to pull oxygen from the glazes and the clay minerals.<ref name="Birks, Tony 1982" /> For example, luster gets its color from deprivation of oxygen. The reduction agent is a substance from which electrons are being taken by another substance.<ref name="Birks, Tony 1982" /> The reaction uses oxygen from the atmosphere within the reduction tube and, to continue, it receives the rest of the oxygen from the glazes.<ref name="Knapp, Brian J 1998" /> This leaves ions and iridescent luster behind, creating a metallic effect. Pieces with no glaze have nowhere to get the oxygen from, so they take it from clay minerals. This atmosphere will turn clay black, producing a matte color.