This print, another from my class at Fleisher, uses chine-colle, sugar lift and hard ground. I started out using sugar lift (a gooey mix of sugar and water) to paint the trumpet- and heart-like shapes. When that dries, a layer of hard ground is put on top. The plate is then immersed in boiling water, which dissolves the sugar and allows it to "lift" off the plate, while the hard ground stays put, leaving the original drawing exposed. Hard ground was later used again for most of the thinner, cleaner lines.
The two larger shapes started out as doodles from my head (something I normally avoid). Some of the smaller details in chine-colle came from an amalgamation of images on the cover of a science lab supply catalog I had with me at the time. DNA, test tubes, etc. If you are curious, the catalog was from Millipore, they make amazing filters, although the images were pretty arbitrary. The plate was really meant as an experiment with sugar lift and other techniques, but I am mildly satisfied with the end product.