We wisely opted to paint the floor of Heather's studio with oil-based paint. Which meant that we had to clean our brushes with mineral spirits. I emptied a coffee can into a baggie and used the empty can to rinse our tools and fingertips. Because it took us a week to paint it (each coat took 24 hours to dry, and it took 4 coats), we've had the can full of milky solvents for a while now.
What's interesting is that the vapor above the polluted liquid in the can must expand and contract within the exact same temperature range as our loft. About fifteen minutes after we give up on layering and turn on our expensive heat, the can makes a distinctive "bloop" popping sound. It makes a similar sound 20 or 30 minutes after we turn of the heat, as the can contracts. Like clockwork.