Red seedless grapes are table grapes carried by most grocers. They are dark red, sometimes oval shaped. Each grape is juicy, the taste sweet with a hint of sour.
Visible discoloration or mold is bad. The skin of each grape should feel swollen, not wrinkled or mushy. The faint white powder, called bloom, is only a protection against decay, and is edible. Keep grapes refrigerated until they show signs of withering, usually after a week.
Rinse grapes before consuming. They can also be halved and tossed in a rotini salad, or sliced thinly and eaten on sugar cookies. Try this: Roll them in caramelized sugar and freeze them!