Hey I just for the fun of it ran a test on the rabbit. I used 140# 300 gram acid free stock pretty heavy stuff as you know.
I ran it at 3 different settings 60/15---80/20-----60/25 speed and power
60/15 cut out the rectangle almost 100% was a tiny little tab I had to pull. I could see a very very light tan on the edge with 225 pwr glasses on barley noticeable ,
80/20 didn't cut thru
60/25 cut it out 100% with a slightly darker tan around the edge and seriously you can stll barley see this tan edge .
I have no doubt that with a little more tweak like maybe 60 / 22 you would have no edge color at all and Like I said the way it is you have to strain to see it anyway.