I suspect you’ve got a fatty acid issue caused by your stuck/sluggish fermentation. S. cerevisiae can emit fatty acids when under fermentive stress . . .
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A winemaker asks for some pointers on when to test for sulfite on their wines using their new sulfite testing kit. Also, learn about curing wine plating, basic equipment required for a winemaker making the jump from kits to fresh grapes, and preparing oak for wine.
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Bottling Tips and Wine Judge Etiquette
Bottling is typically the final step towards producing wine where a winemaker can foul things up. Get some recommendations from the Wizard on when and how to bottle your wines. Also get some pointers on proper etiquette of being a wine judge.