I am super surprised how much fine detail came out in this one as opposed to my last
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You do this kind of burning on a textile canvas?
Indeed, the result is very effective.
Would be curious to see the Human Torch (Fantastic Four) with this method. Would be appropriate as we burn material… 
I picked up some framed pre-painted white canvases on sale from a craft store. I have had pretty good luck with them, but discovered there is a fine line between etching and see-thru.
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I paint the canvas white, spray it black then burn the negative into it.
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Yes, I know. I read that in another posting. Still amazed you can burn the black and leave the white. 
Finding just the right settings is the trick, so lots of materials tests
For those doing 100+ parts, this is no big deal. Cost of doing business. For those doing a lot of one-off projects, this is a substantial portion of the project cost.