Does the catechin/tannin ratio decrease in all varieties?
Yes, there is a decrease in all seeded varieties but the degree of decrease and the value of the ratio may be quite different. Syrah is a variety that tends to have ripe seeds in warm areas and yet the ratio still declines if the seeds are not fully ripe. Pinot noir is a variety that tends to have unripe seeds. The ratio may decline substantially during a harvest window and the value of the ratio is much higher, as much as ten times higher than Syrah for example.
