I haven’t seen this method of proofing on any other linocut websites (and there are quite a few!) but it may be because I’m always trying to squeeze more detail out of a fairly “coarse” medium.
This video goes into the process of proofing with a rubbing, in order to see what is actually cut. Since the process is to do a black line drawing on the lino, then cut away everything else, it’s often difficult to “see” the cut areas clearly as work progresses. The rubbing reveals all this easily.
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