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:
“He is said to have been the last Red Man
In Acton. And the Miller is said to have laughed
If you like to call such a sound a laugh.”
—Robert Frost (1874–1963)
“Manhattan. Sometimes from beyond the skyscrapers, across the hundreds of thousands of high walls, the cry of a tugboat finds you in your insomnia in the middle of the night, and you remember that this desert of iron and cement is an island.”
—Albert Camus (1913–1960)