Still feeling inspired by the first meeting of our new artists’ group last week, I managed to spend a sizeable chunk of time in the studio over the weekend - and made good progress with the Captain. I tried some spit bite which wasn’t so successful. Using the copper sulphate solution straight from the bath etched a little, as you can see from the above scan; I kept adding more of the etch every five minutes or so, which produced the sort of effect I wanted. However, the bite was so shallow and delicate that I managed to remove it completely when I degreased the plate for the next aquatint. Back to the drawing board.
On googling ‘spit bite with copper sulphate’, I found this rather interesting site which recommends mixing a solution of 800g copper sulphate crystals to 1 litre of water; a much stronger solution than in the bath (which is also partially spent). The images of test strips on the site look promising so my goal for this week is to try it out.