For tincture the best stuff to use is a high volume alcohol, everclear, moonshine, 189/190/195. Yeah 150/151 will work, but those volumes of alcohol still contain about 30% water, which will make everything you might use your tincture for take that much longer to burn-off that watered down alcohol which will make whatever edibles you might make taste more like burnt cannabis tincture than the flavorings of the item you might be making. For example, say you were making lollipops, the burn-off period for 25ml of 190 proof infused tincture at 160c/320f, is 48 seconds, and the burn-off period for 25ml of 151 proof infused tincture at 160c/320f, is 186 seconds. So because you must cook the lower volume alcohol tincture longer to burn-off all the alcohol and water it contains, you end up with edibles tasting more like burnt cannabis tincture, than say a nice grape flavored lollipop that is infused with cannabis!