Red grapes gives a beautiful pinkish golden color while black grapes gives a more reddish color.
The amount of sugar used should depend upon the sweetness of grapes you use. The grapes I used were red and really sweet.
Sweet grapes + 800 gm(4 cups) sugar = Very sweet wine
Sweet grapes + 600 gm (3 cups) sugar = Sweet wine
Sour grapes + 800 gm (4 cups) sugar = Sweet wine
Disclaimer:
Contains alcohol.