Whenever I get a new batch of grapes, I obviously analyze immediately after crush. But, the hydrometer brix readings are always about 1-2 points above the refractometer, probably due to the solids suspended in the must. Is it legitimate to accept the refractometer readings as accurate?
How would you clear a freshly crushed must of solids? It's not like you can filter it. Putting it through a strainer is about as good as I can get, but even then, there are huge amounts of "solids", which prevent the hydrometer from floating freely.
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