Unexplained stains

Exploration Stage: Stained-Glass Mezzanine
From: Juliette
Description: Oh boy... we're in trouble if we can't track down the golden bees! Was it a coincidence that the stained glass loft appeared out of the fog? Everything in here is so old... no, it's not. I saw a new ink stain just now! Where was it...look for it with me!
Completed: Thank God you found it! This is definitely a new stain. And yet there's not a drop of ink left in the inkwell... it looks like it dried up a long time ago. That means someone has been here recently. Who might know where the golden bees are.