Furthermore, even from the tablet upon which the deposition is written one can tell that he has given false evidence. For it is whitened, and was prepared at home. As the deposition was written, (with a dark pigment) on a whitened tablet, it had obviously been prepared in advance. An off-hand answer to a challenge would have been written on a waxed tablet. Yet it is only those who testify to facts who should offer depositions prepared at home; those who testify to challenges, who stand forward on the spur of the moment, should present their depositions written in wax, in order that, if one wants to add or to erase anything, it may be easier to do so.