Copper solutions are a great way to add copper to barrels or to lab samples.
Typical addition rates for copper are below 0.5 ppm, which makes for a small amount of CuSO4 to weight out for a lab sample, and a tedious chore for a barrel group.
Also, having a stock copper solution on hand makes it easy to diagnose sulfide problems and determine the correct treatment level with a lab trial.
Note: Copper solution calculations on WineAdds are in terms of copper ion concentration (Cu+2), not CuSO4 concentration.
