פירוש על עבודה זרה 76:12

Another baraita teaches that even if the date-husks are cooked in a large cauldron, the mixture is permitted. This is because the taste that the cauldron imparts to the brew is considered to be a worsening taste, one that does not improve the flavor of the brew. This baraita holds that in such a case the mixture is permitted. [Note that the reason that the flavor is considered to be worsening is that the cauldron has not been used for 24 hours. After 24 hours any taste imparted is legally considered to be bad taste]. The other baraita holds that even though the taste is bad, the mixture is still prohibited.