Copper fining bench trial
Based on the comments we got from Bob at the BevPeople, we decided to try a copper fining bench trial. I followed the procedures in MoreWines copper fining paper.
- Sample 1: 0.o ppm 1% CuSO4 added.
- Sample 2: 0.1 ppm 1 % CuSO4 addded.
- Sample 2: 0.3 ppm 1 % CuSO4 addded.
- Sample 2: 0.5 ppm 1 % CuSO4 addded.
Erwin and I could both clearly smell the difference between the control and the 0.5 ppm. I blind tasted the 0.5 ppm vs the control and had no problem figuring out the better one. Erwin blind tasted the 0.3 and 0.5 and was able to pick out the better one. I had a harder time between thos two.
Based on this, we chose to do the full 0.5 ppm addition to the rest of the wine. 0.5 ppm is the legal limit for residual copper in finished wine.