R' Yehoshua ben Beseira testified concerning the blood of neveilos that it is tahor. R' Shimon ben Beseira testified concerning the ash of the chatas [parah adumah ashes] that if a tamei touched part of it, he has rendered all of it tamei. R' Akiva added regarding the fine flour [of minchah-offerings], the incense [used for the twice-daily incense-offering in the Temple], the frankincense [used with various minchah-offerings], and the coals [of the Altar] that [if] a tevul yom touched part of them, he has rendered the whole of them unfit.