B&O Freight Car Brown, was Re: B&O Wagontop

gettheredesigns <rick@...>

Tiny nit, Tony and Jim. Ferrous oxide is black (Fe+2). Ferric oxide (Fe+3) is the red-brown pigment, and also rust, with Tony's caveats. Different oxidation state = different crystalline structure = different color.

With that said, the term "ferrous" has a more general meaning (outside of chemistry) of "containing iron", and that might be what the paint-specifiers intended.

Peace, Rick Aylsworth

Tiny nit, Jim, but it's the other way around. Rust is
basically ferrous oxide, though hydrated and with other compounds
also, depending on the environment and temperature of the rusting.
Ferrous oxide, like most natural oxides, is stable as is (note
I didn't say "rust"). But PAINT can weather and deteriorate, even if
its pigment is stable.

Tony Thompson Editor, Signature Press, Berkeley, CA
2906 Forest Ave., Berkeley, CA 94705 www.signaturepress.com
(510) 540-6538; fax, (510) 540-1937; e-mail, thompson@...
Publishers of books on railroad history

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