[We] write [it] with anything: with ink, with orpiment, with red pigment, with gum, with ferrous sulfate, or with anything which is lasting. [We] do not write [it] with liquids, nor with fruit juice, nor with anything which is not lasting.  [We] write [it] upon anything: on the leaf of an olive tree; or on the horn of a cow, and he gives her the cow; or on the hand of a slave, and he gives her the slave. R' Yose the Galilean says: [We] do not write [it] on a living creature, nor on food.

[We] do not write [it] on something attached to the ground. [If] he wrote it on something attached, and [then] detached it, completed it, and gave it to her, it is valid. R' Yehudah invalidates [it], unless its writing and completion are done when [it is] detached.  R' Yehudah ben Beseira says: [We] do not write [it] on paper which has been erased, nor on unfinished parchment, because it can be forged; the Sages, however, validate [these].