As a none grape, home vintner I suggest you mark one type of boxed grape
"Cab Sauv" and the other "Franc" in a distinctive and different colour.

Can't think of a better way --- off hand!

--
Trevor A Panther
In South Yorkshire, England
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I am having difficulties in recognizing these two grape varieties on
their harvested appearance. Once in boxes they both look the same. Any
tips on how to easily differentiate between them?
Many thanks.