When the black-skinned grapes are allowed to macerate with the grape juice, it takes on the reddish hue. Wine making process, grape variety and oak ageing also contribute to the colour intensity of the Red Wines.
Some popular Red wines are made from Cabernet Sauvignon, Merlot, Shiraz or Syrah, Pinot Noir, Grenache, Malbec, Tempranillo, Sangiovese and Nebiollo varieties of grapes.