the founction just like menthol, but much advance than menthol, no biter, no irritating no matter be added more or less,
longer-last-cool feelings than the menthol's.
The cool-feeling stronger than the menthol;
it is a best cooling additives for v. can make ec tastes icy, cool, fresh. for all kinds of cooling agents, the WS-23 coolant is the most welcomed cooling additive.