Parallel to the Peripheries project there are other prints being made for various exhibitions and group shows. One of these is an etching combined with carborumdum, and using sugarlift.
This is a method of making a positive mark on the plate using a soluble resist (the sugarlift) which allowed to dry, then this is then covered with bitumen. After the bitumen dries hard, hot water is poured over the plate to dissolve the sugarlift , lifting off the bitumen, to reveal the shape. When this is finally revealed the bare copper is degreased and the aquatint is applied, creating an area of tone.
See here for a video of the process.