did you use prosthetic gelatin for this? I ask as round the thumb, it's got that gelatin look to it. Looks good, like the transitional aspect of it... it doesn't just stop, which can be a bit of an issue with a large area like the arm.
BTW, found the best thing to color gelatin is food coloring.
Yeah its gelatin. I've used food colouring a lot with burns and I was actually thinking when I was doing this one that I should have made up a couple of batches of black and white gelatin just to get better colour... oh well..