I'd say ill advised. Can you tell me you have a coating of Fe ?
I hope not. It would rust.

Is the layer all Ni ? - likely not enough and magnetic.

Is the layer all Chrome ? more likely with pitting of localized Fe -
needing to be neutralized with Citrus or Nitric.

Stainless is a complex steel. I'd etch with grit and resist.

Martin

On 4/3/2011 4:34 PM, shmoeusn wrote:
responding to
http://www.rittercnc.com/metalworkin...ng-498310-.htm
shmoeusn wrote:
is it possible to achieve the various shades of black and gray to etch a
photograph with this method?