Tar is found on the inside of a sandal. Is this an interposing substance?
Halacha 8 states that for sandals, tar on the upper surface (inside) is an interposition, while tar on the lower surface (the sole) is not.
Question 2
A container is fully filled with milk and immersed in a mikveh. Is the immersion valid?
Halacha 18 teaches that a container filled with liquids (other than water) is as if not immersed, because the liquid prevents mikveh water from reaching the interior.
Question 3
Why must a hole be drilled in the side of an inkwell before immersing it?
Halacha 15 states that an inkwell does not regain purity until a hole is made in its side, enabling water to enter its curved portions which cannot otherwise be reached.
Question 4
Blood is found on a butcher's apron when immersed. Is this an interposing substance?
Halacha 6 explains that blood on a butcher's garment is not a chatzitzah because the butcher does not object to its presence there.
Question 5
If impure keilim are placed inside an impure container and all are immersed together, what is the result?
Halacha 26 rules that keilim placed inside an impure container and immersed together are all purified, because mikveh water can enter even through a narrow opening.