re: Minecraft TNT

Hi, I was wondering, how did you get the “edge” look on the fondant for the tnt blocks? I know you did some black paint to give it the shadowing, but it seems as though there’s also some sort of indentation? I’ve been debating the best way to go about possibly doing that (if that is what you did, and it’s not just an optical illusion from the amazing paint job!). Thanks!

Also I’d like to note, it would be for my son’s birthday this weekend :)