Been trying to make decent Halo Purity Sub Zero clone for around a year I have finally settled on this recipe. I love the stuff but expensive in UK and costing me a fortune.
Menthol is crystals 50/50 diluted in PG.
It can be speed steeped ie hot water, microwave etc but best left for 10 to 14 days and will even turn the same pink color as Sub Zero.