I've heard some do the cold process for many weeks. If using fresh I just decarb in oven in a foil packet. Works fine. I reduce my tincture on stove like a sauce but using electric stove, saucepan and very low heat. No fan running but I open my sliding glass doors. I've never had an issue but here in FL the everclear I get is only 151 not 190. If I had gas stove I wouldn't even attempt. I've heard of folks having very good luck leaving a fan blowing across the top of the jar to speed evaporation without heat too.