Inedible Ink

I was polishing off a red velvet muffin when i noticed some crumbs on one of my fingers, so i licked them off. However, there were a couple of stubborn crumbs that refused to budge, in spite of me having licked my finger repeatedly. Upon closer inspection though, i realised why - those were not red velvet crumbs but rather red ink stains from the marking that i had done earlier. Eating ink - yet another sad marking milestone accomplished.