Does your second cut hit 190 proof? And how much ethanol is left in the mash?
Not in a pot-still.
190 proof alcohols (and even 151's) are normally done in reflux stills. A single run from a pot still will give you 40 - 60 proof..., probably close to 40 after combining the end products into a single, finished batch.
After all the "beer" has run (mash is when you remove the sugar from the grain and it's dissolved into the water :wink
, you combine the product, and run it again. That will give you 80+ proof, probably closer to 100, and then some fellows run it a third time, getting it up to 120. At that point any higher and you lose flavor. Hence as mentioned the XXX marking, or when John Wayne tells Kim Darby in
True Grit, "It's the genuine article.
Triple rectified; aged in the keg!"
What you have then when using corn..., moonshine, or white whiskey, which if you placed it in a barrel with charred oak sides, will give you bourbon after several years of careful tending. Cheap brands use a glass container and added activated charcoal and wood shavings.
THEN when the aged product is bottled it's often "stepped on" by adding a very good water, to bring it down to 80 proof, but some of the bourbons that are 100 proof just might have been 120 when they went into the keg, and over time as aging has taken some alcohol, they naturally came down to 100 proof.
OH and 151 level alcohols sold in bottles as "rum" or something else, have been mixed with lower forms of the same product to give them flavor.
190 proof alcohols (or 189 if you're in Maryland and obeying a stupid law) are solvent. You can use them for first aid, you can fuel an alcohol stove or burner, you can extract herbal medicines, you can use them as a fuel additive..., or you can step them down, and add flavor.
You can also make something like
limoncello, or
Orange Bitters with 190 Everclear, and impress your friends at Christmas or other occasions. :wink:
LD