A Chemical Spill or Toxic Liquid token not sitting on a base. The spilt dangerous liquid is spreading and bubbling up as it dangerously reacts with objects it comes into contact with.
The token is approximately 0.75 x 0.87 inches (19 x 22 mm) wide and 0.16in (4 mm) high. It was originally designed for Extreme Danger, an expansion to the popular cooperative board game Flash Point: Fire Rescue.
A chemical spill token with a base can be found at this listing
A set of 5 chemical spill tokens without bases can be found at this listing