[If] a ladleful of corpse powder was scattered inside a house, the house becomes tamei. R’ Shimon declares [it] tahor. [If] a quarter [-log] of blood was absorbed into a house, the house is tahor. [If blood] was absorbed into a garment — if a quarter [-log] of blood comes out when [the garment] is washed, [the garment] is tamei. If not, it remains tahor, because whatever is absorbed and cannot come out is tahor.