The goop is, as you said, an alkaline solution, one component of which is NaOH. I've never had any adverse reaction from touching it and quickly wiping it off; some people notice a slight tingling sensation. I usually peel from the side nearest the tab, and fold the negative in on itself to avoid touching the goop. The negatives from 3000B aren't printable; the best you can do is let them dry (5-15 minutes) and scan the (very fragile) emulsion layer.