3 1/2 c. sugar
2 c. grape juice
1 bottle Certo, liquid pectin

Stir together sugar and juice and put on high heat. Bring to a boil. Add 1/2 bottle Certo and return to boil. Add the rest of the Certo and boil 1 minute, stirring constantly. Remove from the heat and skim the foam from the top after it has stopped bubbling. Put in jars and seal.