Related על מעשרות 1:7

One who consecrates his wine vat -- [it is liable for tithes] before the seeds formed lumps and he siphoned off the froth ("שילה וקופה," see Yer. Challah II.3.9, Guggenheimer Tr.) [he is exempt] -- but once the seeds formed lumps and he siphoned off the froth, and the Temple Treasurer came or he redeemed it -- he is liable. [If] he consecrated it before the seeds formed lumps and he siphoned off the froth, and [before] the Temple Treasurer came, or the seeds formed lumps and he siphoned off the froth and and afterwards he redeemed it -- since at the time that [the vat] was subject to being liable (i.e., as the processing had finished) he was exempt, he is exempt. [With respect to] wine whose froth has been siphoned off, even though it has been siphoned off, he may [still] take it from the upper winepress and from the ducts and drink it [without tithing] (Maasr. 1:7).

One who skims [wine] off [the top of] a trough, or skims [wine] off a vessel -- it may be put on a cake or on a large plate (see Maasr. 1:7). One who pours [wine] out from [one] vessel for heating liquids to [another] vessel for heating liquids, from stew-pot to stew-pot, or from pot to pot -- it is permitted to put it on the second, but forbidden to put it [back] on the first.