The glue finally dried! And I added more charcoal to dirty up the front cover.
I added a bit more to the back too.
It's actually cocoa powder, cinnamon, coffee and water. It's pretty effective and smells like cookies!
My muddy book, you can already see how when the 'mud' dries and looks like dirt stains. I ground some into the 4 corner pieces and between the fingers on the hand.