[If] a curtain has been contaminated through [contact with] a secondary tumah, they immerse it within [the Temple com-plex], and they may bring it in immediately. But if it was contaminated through [contact with] a primary tumah, they im-merse it outside [the Temple complex], and they spread it out [to dry] in the Chel; If it was [a] new [curtain], they would spread it out upon the roof of the portico so that the people may see their handicraft, for it was beautiful.

Rabban Shimon ben Gamliel says in the name of R’ Shimon, son of the Deputy [Kohen Gadol]: The curtain was one hand-breadth thick, woven upon seventy-two threads, each thread composed of twenty-four filaments; forty cubits long and twenty cubits wide; and made of eighty-two times ten thousand.  They would make two [new curtains] every year. And three hundred Kohanim would immerse it.