I thought I had done that already, but @ShearGuy has a better answer for you!
That said, also understand that drinkable 190 proof ethanol and n-heptane denatured ethanol are very different animals. I strongly advise people to reclaim and reuse solvent as much as possible, rather than just buy cheaper solvent. It makes a world of difference to use and reuse potable 190 proof, compared to trying to re-use heptane-denatured after it starts forming the ternary azeotrope with water.
I used to advise folks to “weather” their n-heptane-denatured solvent with a bit of water prior to using it, since it will end up with water in it anyway, just so the solvent won’t keep changing during and after every extraction, but even that fails for a couple of reasons:
A. The ternary (3-part) azeotrope of [n-heptane : ethanol : water] forms at least a binary (2-layer) set of solutions, each with different ratios of all 3 components, and thereby different densities (which generates 2 totally different layers of solvent, each comprising about 50% of the total volume).
B. The heptane in the azeotrope not only screws with the consistency of the solution, but also extracts more undesirable stuff from the plant matter… both on its own, and in the variable ratios with ethanol and the inevitable water.
@Future , I don’t know if there is a better database in which to enter this errata, but it does happen, as @cyclopath can attest.