By the look of it, black clay. Never understood why they don’t just put the skull upside down.
“There is always a relevant Oglaf” is a little-known relative of the Internet Rule “there is always a relevant XKCD”. Also, link the author of the stuff you post, it’s better manners.
It is, but Oglaf kinda brings it on itself by not having any author credit embedded in the comic images and not having an easily searchable archive on their site that I can find. Nothing was cut out from the original comic.
I feel like this is being given disproportionate importance, considering it’s a comic being linked in a niche community on a niche social network.