I have heard (without a source) that some who were makpid to purchase only wines with hashgachot would consume wine from Champagne without a hechsher, probably because gentiles typically do not use ...
If non-Mevushal wine was poured by someone who should not have poured it, what should one do? Does it make a difference if: the wine was poured, but not for you (ie., you just have to contend with ...
What's the source (either from the gemara or rishonim) for allowing stam wine to be batel in 1/6 mixture? Does this apply if you can still taste the wine?
This article describes a kickstarter for a machine to make wine quickly out of grape juice concentrates. My question is twofold: Is such wine subject to stam yenam? Is it even Borei pri hagafen?