How do you find the sugar content of grapes using the equipment found surrounded by a institution lab- no external products?

so im asking for the above but with no external apparatus. e.g. a brix meter is a no go
Answers:
standard life synthesis procedure.
Specifically I recommend
put in water.
Distill (heat etc)
Filter
rotary evaporate
recrystallize
assessment for sugar purity by burning, observe flame
wiki anything you dont know.

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