To 2 quarts blackberry juice, add 3 cups sugar and one tablespoon each of whole cloves, whole allspice, whole cinnamon, and whole nutmeg (tied in bag). Simmer 30 minutes. Bring to boiling. Discard spice bag. Pour hot into hot jars, leaving quarter inch headspace. Adjust caps. Process pints and quarts 15 minutes in boiling water bath.