EDM - Should it have a burned appearance?

I have small EDM that I am doing some experiments with. It uses an
RC type oscillator. 42 Volts 1Amp. Petroleum based dielectric fluid.

The general question to those who have actually seen these work
is...Does the area being cut end up looking slightly burnt? Two
possible answers:

1) You are using electrical sparks to cut something and these are
quite hot so naturally there is some burning

OR

2) It should not look burnt and the only reason it does is because
you are getting some arcing.


Thanks.