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Josh Bernbaum
05-30-2012, 07:42 PM
Anyone tried using yellow iron oxide instead of the red iron oxide?
Hoping to throw some in with my next transparent color melt, but wondering
if I should be expecting a similar green that the red iron oxide makes or not.
Thanks.

Dave Bross
05-30-2012, 08:23 PM
If it's a different color iron I would expect it to have a different level of oxidation/reduction.

Iron is sensitive to oxygen levels so you can probably expect a different color.

Maybe not different enough to even notice though.

Pete VanderLaan
05-31-2012, 04:50 AM
It will really be a question of valence and oxygen supplied. Iron can have a lot of different valences. FeO, Fe203, Fe305... on and on.I have actually never heard of "Yellow" iron. Red and Black, Yes, Yellow, no. Some glasses want a lot of 02, some don't. It depends on your needs.

Josh Bernbaum
05-31-2012, 06:16 PM
Did a melt today.
224g yellow iron oxide and 114g red copper oxide mixed in 50# SP87.
This recipe was courtesy of Ed Branson in western Massachusetts, although his had red iron and black copper.
Seems to be a nice turquoise-green.
The one at the top was my previous melt with a tiny bit of cobalt for the light blue.

Pete VanderLaan
05-31-2012, 07:08 PM
Did a melt today.
224g yellow iron oxide and 114g red copper oxide mixed in 50# SP87.
This recipe was courtesy of Ed Branson in western Massachusetts, although his had red iron and black copper.
Seems to be a nice turquoise-green.
The one at the top was my previous melt with a tiny bit of cobalt for the light blue.
******************
The top one actually looks like an intense copper glass to me Josh and the bottom certainly looks like iron and copper. Good Job!

Jon Myers
05-31-2012, 10:17 PM
yellow Iron oxide is common enough in ceramics. I think it is less intense than red and black but I don't really remember... Its used in crystalline glazes

Steven O'Day
06-01-2012, 08:36 AM
Yellow iron - Fe2H2O4
Black iron Fe3O4
Red iron – Fe2O3

Pete VanderLaan
06-01-2012, 08:54 AM
Here's more: ( Thanks Steve.)

Here's what that trustworthy wikipedia says: ( Wanna buy a bridge?)
The monohydrate (FeO(OH)·H2O) might otherwise be described as iron(III) hydroxide (Fe(OH)3), and is also known as hydrated iron oxide or yellow iron oxide.

You're buying contaminated water Josh.
Also:



iron(II) oxide (http://en.wikipedia.org/wiki/Iron%28II%29_oxide), wüstite (http://en.wikipedia.org/wiki/W%C3%BCstite) (FeO)
iron(II,III) oxide (http://en.wikipedia.org/wiki/Iron%28II,III%29_oxide), magnetite (http://en.wikipedia.org/wiki/Magnetite) (Fe3O4)
iron(III) oxide (http://en.wikipedia.org/wiki/Iron%28III%29_oxide) (Fe2O3)

alpha phase (http://en.wikipedia.org/wiki/Iron%28III%29_oxide#Alpha_phase), hematite (http://en.wikipedia.org/wiki/Hematite) (α-Fe2O3)
beta phase (http://en.wikipedia.org/wiki/Iron%28III%29_oxide#Beta_phase), (β-Fe2O3)
gamma phase (http://en.wikipedia.org/wiki/Iron%28III%29_oxide#Gamma_phase), maghemite (http://en.wikipedia.org/wiki/Maghemite) (γ-Fe2O3)
epsilon phase (http://en.wikipedia.org/wiki/Iron%28III%29_oxide#Epsilon_phase), (ε-Fe2O3)

So, I was wrong about the Fe3 05. It's actually Fe3 04. My mistake.


What is important about it is that iron becomes a nucleation point for the growth of crystals which is why many old copper ruby formulas call for Iron in the mix.