Winemaking with grapes?!

Question: Winemaking with grapes!?
Hi I have opicked some grape from a friends greenhouse and they have a greyish dust on them, it is OK to just wash it of or is it mould!?Www@FoodAQ@Com

It's called "bloom" and it's mostly yeast!. After you crush and press the grapes, you add metabisulfite to the must to kill the wild yeasts and bacteria!. After a day, you can add the yeast you want to ferment with!.Www@FoodAQ@Com

Wash them thouroughly, then air dry!. If it comes back it may be mold, maybe should not use them!. If not use them quickly !.Www@FoodAQ@Com

chances are its just yeast, what sort of grapes are they though!? the eating kind don't generally make decent wine!.!.Www@FoodAQ@Com

they should be ok,if it is not mold then ,you can use them!.Www@FoodAQ@Com

if could be something to do with the humidity, if you wash them they should be all rightWww@FoodAQ@Com

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