Brad Leone, Bon Apétit's fermentation specialist, hosts "It's Alive with Brad" on their YouTube channel.
Leone believes the bloom is safe to consume and adds to the grape's flavour.
Bloom on soft fruits is "wild yeast," says food anthropologist Ariana Gunderson. Wild yeast makes wine, beer, and sourdough starter.
According to an excerpt of Pascal Baudar's book "The Wildcrafting Brewer," yeast can change the flavour and alcohol content of fermented drinks
In sourdough bread or natural wine, wild yeast adds stink.
Eating the bloom won't hurt you, but be sure it's organic. If not, wash off the residue because it may include pesticides you don't want to ingest.