With what may we surround [the utensil]? With plaster or with gypsum, with pitch or with wax, with mud or with excrement, with mortar or with crushed shards, or with any substance that can be smoothed. We may not surround [a utensil] with tin or with lead, since they cover but do not seal. We may not surround [a utensil] with a fat pressed fig or with dough kneaded with fruit juice, so that it does not come to be disqualified, but if one did surround [with food], it has protected [the utensil].