http://www.durgan.org/URL/?DKBJT 14 September 2011 Boca Noir Grapes
Boca noir grapes nine pounds were picked today, and made into juice. This grapes makes a very fine juice. The clusters do not ripen evenly, and if left too long on the vine the ripe ones fall off, and bugs infest the clusters, and sometimes mold. The grapes on the cluster are close knit. It takes about two pounds of grapes to make a liter of juice.
Method was to remove the grapes from the clusters by swiping across a one inch screen, weighed, washed, water added to just cover the grapes and boiled lightly. The grapes were then made into a mash and strained, Pressure canned at 12 PSI for 15 minutes for long term storage at room temperature.