Try Ammonia Cer (IV) nitrate in Nitric Acid. Merck (the German chemical
supplier) has ready to use mixtures. They are dedicated to etch
chromium, but should work with Nichrome as well.
They have 2 different products:
Issue No. 1.11547 Chromium Etchant VLSI
Issue No. 1.10602 Chromium Etchant H VLSI
Normally it's used for chromium masks.

Best regard

Armin

P.S.: Has anyone a good wet etchant for Tungsten.

>From mems-mgr@isi.edu Sat Jun 27 12:20:43 1998
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>Message-Id: <199806271913.MAA29850@darkstar.isi.edu>
>Date: Fri, 26 Jun 1998 05:24:06 -0700 (PDT)
>From: cjmm@ntl.pim.tsinghua.edu.cn
>Subject: about etchants of Nichrome
>To: MEMS@ISI.EDU
>X-URL: http://mems.isi.edu/mems.html
>Reply-To: cjmm@ntl.pim.tsinghua.edu.cn, mems-cc@ISI.EDU
>
>
> I want to know how to make etchants of Nichrome which can be used with
resist !
>
>
>Tang Yanghua
>
>
>


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