> Is there a way to etch chrome oxide ? i tried gold etchant as
> recommended by a memsnet user, but that didn't work.

What do you mean with "gold etchant" ?
I do not know which gold etchant you are using, i use a gold etchant from
sigma aldrich, i do not remember the chemical composition, but it has a
dark red color. Such gold etchant does not etch Cr at all...

Best regards,
Andrea