35:20 ratio of (85% phosphoric acid):(chromic acid) @ 80C
from J. Electrochem. Soc., Volume 106, Issue 6, pp. 481-485 (1959)

It wasn't a MEMS application, but they used Al foil, and then
anodized, and selectively (and slowly) etched away the oxide they
formed on top of it for TEM analysis of the oxide film.

On Wed, Jun 20, 2012 at 5:44 AM, Ned Flanders  wrote:
> Does it exist?
> If it etches alumina and not aluminum at all, it gets extra magic points.
>
>
> Help?
> _______________________________________________
> Hosted by the MEMS and Nanotechnology Exchange, the country's leading
> provider of MEMS and Nanotechnology design and fabrication services.
> Visit us at http://www.mems-exchange.org
>
> Want to advertise to this community?  See http://www.memsnet.org
>
> To unsubscribe:
> http://mail.mems-exchange.org/mailman/listinfo/mems-talk
_______________________________________________
Hosted by the MEMS and Nanotechnology Exchange, the country's leading
provider of MEMS and Nanotechnology design and fabrication services.
Visit us at http://www.mems-exchange.org

Want to advertise to this community?  See http://www.memsnet.org

To unsubscribe:
http://mail.mems-exchange.org/mailman/listinfo/mems-talk