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Sukka (49a-b) describes this and mentions that the young Kohanim would clear out the congealed wine from the shitin (a large cavern beneath the altar, into which the libations would run, see Rashi 49a s.v. שיתין) every 70 years. In a b'raisa, Rabbi El'azar bar Tzadok describes the "congealed wine" as "similar in form to cakes of pressed figs": אמר רבה בר ...
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