Ask Wine Wizard
Sulfite Question When Blending Wine
Greg Ambrose — Pottstown, Pennsylvania asks,
I have two wines made from grapes and stored in oak barrels. During aging I have monitored for free SO2 routinely (every 3-4 months) and topped off with the appropriate sulfite necessary based on the pH and the calculations from the sulfite calculator at www.winemakermag.com/sulfitecalculator. Herein lies my question: I would like to blend these wines prior to bottling. If the free SO2 is appropriate for each wine separately, will I need to retest and adjust again after they are blended? Or can I assume that the combined wine will have the correct free SO2 based on the fact each separate wine was adjusted properly?