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:
“What art can paint or gild any object in afterlife with the glow which Nature gives to the first baubles of childhood. St. Peter’s cannot have the magical power over us that the red and gold covers of our first picture-book possessed. How the imagination cleaves to the warm glories of that tinsel even now! What entertainments make every day bright and short for the fine freshman!”
—Ralph Waldo Emerson (1803–1882)
“Morality, a muzzle for the will; logic, a climbing iron for the mind.”
—Franz Grillparzer (1791–1872)