3½ cups (1¾ lbs.) juice
7 cups (3 lbs.) sugar
1 bottle Certo
To prepare juice, crush about 1 quart fully ripe blueberries. Stem and
crush about 2 pounds fully ripe cherries. Do not pit. Add ¼ cup water,
bring to a boil, and simmer, covered, 10 minutes. Place fruits in jelly
cloth and squeeze out juice. Measure sugar and juice into large
saucepan, mix. Bring to a boil over hottest fire and at once add Certo,
stirring constantly. Then bring to a _full rolling boil_ and boil hard ½
minute. Remove from fire, skim, pour quickly. Paraffin at once. Makes
about 10 glasses (6 fluid ounces each).