When I make wine (one 5 gallon carboy at a time) I stomp the grapes in a 35 gal square heavy duty tub, pour into an Igloo with a false bottom (also used in all grain brewing), and press a plate down to extract as much juice as possible. Sometimes I need a fine mesh over the carboy lid to catch seed fragments.
1 Like
Could be honeydew, sugary substance excreted by some phloem feeding insects (like scale or spotted lanternfly). It’ll turn into sooty mold, black in color, when colonized by microorganisms.
That makes sense. It looks a lot like the scale on my citrus.