This method is fairly new to me, and so I've been messing about with some scraps of copper and different resists; varnish, acrylic paint, marker pen and vaseline...
I've found the vaseline particularly interesting, spreading it in a thin layer and using a pencil/needle/finger to draw through it and move it about on the plate... lots of potential there I think...
And what I'm really looking for is a kind of soft ground etching technique (as I sometimes find hard ground etched lines too fine; soft ground lines have a softer, blunt pencil like line which I like), vaseline seems to have potential for this too... any ideas??
Sorry if this is all a bit garbled, it's been a busy day... But there's nothing like a good old experiment is there :)