As promised an update to show how the véraison is now complete and the berries are all various hues of purple. This colour will deepen as they approach ripeness.
The whitish film on the grapes is the waxy bloom which serves to protect the fruit from water loss and attack by fungal pests. Is has nothing to do with yeast, as is commonly supposed, although there are no doubt yeasts lurking there too.
Yeasts of different species are found basically everywhere, floating in the air looking for nice sugary solutions to turn into alcohol or vinegar.
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