Cardboard

At work our fancy printer cartridges come in nice sturdy cardboard boxes. I've used them to make odd things every now and again (snoots for flashes etc) but I thought it would be a fun material to draw on.

Here's a couple of tests. On the second I was trying out some different pens including an extra broad copic marker and a weird Kuretake chalk pastel pen. When you first draw with it it's invisible and then slowly the white appears as the 'ink' dries. I need to experiment a bit more but it's fun to have a few more tones to play with...