solid dry ice or an acetone/dry ice mixture can be used in a cold finger as a coolant, which allows cooling of the vapour stream to below 0 °c, a matter critical in the condensation of low boiling liquids (such as dimethyl ether, −23.6 °c). likewise, other chilled liquids can be circulated through typical water-cooled condensers; circulating coolants include water–ethylene glycol cosolvents (antifreeze solutions), and pure liquids such as ethanol, in either case pumped in a closed loop (recycling) fashion from a chiller-circulator under thermostatic control.