WARNING: This product contains nicotine. Nicotine is an addictive chemical.
The Flavor Apprentice Koolada - DIY E-Liquid Flavoring
This vapor juice flavor is also known as "W3" Koolada is used specifically to give that "cold" feeling at the back of the mouth.
It does not really have a 'taste', but it can be used in conjunction with menthol.
try using 4 drops per 4ml of eliquid.