Based on the context and the answer, generate a question. 

Context: The house smirks and goads me on to tackle the green cave . Painstakingly I rub down and smooth the tired , faded , parched wood , then , finally dip my pad for the first time into the brown liquid that smells of artists ' studios and craftsman 's workshops . I take a deep breath .

Answer:

Paint



What is the brown liquid ?