These are drawings I made while looking through a book called Conserving (by Daniel and Geo Fuchs). The book features photographs of animals and humans preserved in formaldehyde.
I worked with Aquacolour Monolith pens, which are really starting to grow on me. They are quite hard and don't blend very much unless you use water, which I usually don't, and don't erase well. But as I grow more and more used to them I'm starting to appreciate their qualities. The colours are great and when you work out how to combine them they work really well together. The trick is lay down subtle layers over and over, until they mesh.