Cranberry Grape Jelly

3 1/2 C Concord Grape Juice
3 1/2 C Cranberry Juice- unsweetened
9 C sugar
2 boxes pectin

mix in large pot
3 1/2 C  Concord grape juice*
3 1/2 C unsweetened Cranberry Juice
9 C sugar
Bring to a boil and add:
2 boxes pectin
Bring to a rolling boil for 1 minute take off heat
Add 1 tsp butter to get rid of foam
put in pint or 1/2 pint jars and process in water bath 10 minutes

makes 14 1/2 pint jars

*make sure to strain grape juice through cheese cloth and sieve to remove sediment so crystals will not form in jelly (grape juice should be made day before or older)