4 cups (2 lbs.) prepared fruit
7 cups (3 lbs.) sugar
½ bottle Certo
To prepare fruit, crush or grind about 1 quart each fully ripe
blueberries and raspberries. Combine fruits. Measure sugar and prepared
fruit into large kettle, filling up last cup with water if necessary.
Mix well and bring to a _full rolling boil_ over hottest fire. Stir
constantly before and while boiling. Boil hard 1 minute. Remove from
fire and stir in Certo. Then stir and skim by turns for just 5 minutes.
Pour quickly. Paraffin at once. Makes about 10 glasses (6 fluid ounces
each).