Fully ripe currants are colored, juicy and beginning to soften. Quality does not improve after harvest. Fruit of some of the newer cultivars often turns a very light to dark red when mature. Overmature fruit is purplish. Quality does not improve after harvest.
Grapes change color before they are ripe.
Harvest when ground color changes from green to full yellow. Red color is not a reliable index of maturity. Taste one or more of the fruits before harvesting to correlate ground color with flavor. The skin changes color before the fruit is mature. Harvest with the cap.