Red Iron
Iron is commonly used as a colorant in its red iron oxide form as (Fe2O3). Red iron oxide is commonly used to produce earthy reds and browns. It is the metal responsible for making earthenwares red. Iron is also another tricky colorant because of its ability to yield different colors under different circumstances. At low percentages (.5-1%) and in the presence of potassium, iron will become light blue or light blue-green in reduction (as is seen in traditional celadons). In the presence of barium, iron may become yellow green. When used in combination with calcium, red iron oxide can become pale yellow or amber in oxidation or green in reduction. Common percentages for red iron oxide range from (4 up to 10%).
Read more about this topic: Ceramic Colorants
Famous quotes containing the words red and/or iron:
“look the spangles
that sleep all the year in a dark box
dreaming of being taken out and allowed to shine,
the balls the chains red and gold the fluffy threads,
put up your little arms
and i’ll give them all to you to hold”
—E.E. (Edward Estlin)
“By the flow of the inland river,
Whence the fleets of iron have fled,
Where the blades of the grave-grass quiver,
Asleep are the ranks of the dead:—”
—Francis Miles Finch (1827–1907)