We have a fair number of members who grow red hybrids, so this article may be useful:
https://winemakermag.com/technique/red-hybrid-color-stabilization
The first winemaker says extraction is not the problem, it's keeping the color stable and not losing it.
I find it interesting that the first two winemakers disagree with each other -- the first one says to not use fermentation enzymes, while the 2nd says to use Scottzyme ColorPro. A good experiment is to make a carboy with, and one without, to see how the compare after a year.
https://winemakermag.com/technique/red-hybrid-color-stabilization
The first winemaker says extraction is not the problem, it's keeping the color stable and not losing it.
I find it interesting that the first two winemakers disagree with each other -- the first one says to not use fermentation enzymes, while the 2nd says to use Scottzyme ColorPro. A good experiment is to make a carboy with, and one without, to see how the compare after a year.