Yerushalmi Avodah Zarah 2:5 ירושלמי עבודה זרה ב׳:ה׳

MISHNAH: ²⁶⁰In the Mishnah this text follows Mishnah 5 which belongs to Halakhah 6. The sequence of the Halakhah also is the one in the Babli and Maimonides’s Mishnah Commentary. Gentiles’ grape kernels and skins²⁶¹Which remain after the production of wine. are forbidden and the prohibition is of usufruct, the words of Rebbi Meïr. But the Sages say, moist they are forbidden, dry permitted.

HALAKHAH: “Gentiles’ grape kernels and skins,” etc. Rav Sheshet in the name of Rav: Moist they are forbidden even for usufruct; dry they are permitted even to eat²⁶²In the Babli, 34a, ascribed to the Galilean R. Joḥanan.. But did we not state²⁶³Mishnah 4:8., “it does not become libation wine until it descends into the cistern²⁶⁴Grape juice pressed out of grapes does not become forbidden before it is collected in a vat below the wine press. Since kernels and skins are kept in the press they should not become forbidden.”? Rebbi Abba in the name of Rebbi Judah: The Mishnah is about one who lowers them into the cistern²⁶⁵The only skins forbidden are those put in the fermenting wine to give it red color..

There we have stated:²⁶⁶Mishnah Kelim9:5. “And so it is with new solid matter of olives; but old one is pure.²⁶⁷If the solid remnants in the olive press which remain after the production of oil are impure, they impart impurity only as long as they are somewhat moist. Once they are stone dry they do no longer impart impurity to clay vessels.” What is new? Within twelve months. Old, after twelve months²⁶⁸The same is true for grape skins used for the production of Gentile wine. Once they are completely dry, having dried out for a full 12 months, they are forbidden no longer; Babli 34a (attributed there to Samuel)..