Tightly sealed earthenware utensil is not מטמא from the outside.

If one utensil is inside another earthenware one and the rim of the inner utensil is above the rim of the outer utensil if there a ש ר ץ in the airspace of the outer utensil and food in the airspace of the inner utensil the food is טהור.

An unfinished metal utensil is susceptible to become טמא.

An unfinished bone utensil is susceptible to become טמא.

Large שקדים המרים are edible.