Colossians 2:14

Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross;

[Blotting out the hand-writing of ordinances] By the hand-writing of ordinances the apostle most evidently means the ceremonial law: this was against them, for they were bound to fulfil it; and it was contrary to them, as condemning them for their neglect and transgression of it. This law God himself has blotted out.

Blotting out the hand-writing is probably an allusion to Num 5:23, where the curses written in the book, in the case of the woman suspected of adultery, are directed to be blotted out with the bitter waters. And there can be little doubt of a further allusion, namely, to the custom of discharging the writing from parchment by the application of such a fluid as the muriatic acid, which immediately dissolves those ferruginous calces which constitute the blackening principle of most inks. But the East India inks, being formed only of simple black, such as burnt ivory, or cork, and gum water, may be wiped clean off from the surface of the paper or parchment by the application of a wet sponge, so as to leave not one legible vestige remaining: this I have often proved.

[Nailing it to his cross] When Christ was nailed to the cross, our obligation to fulfil these ordinances was done away. There may be another reference here to some ancient mode of annulling legal obligations, by nailing them to a post; but I do not recollect at present an instance or example. Antiquated laws are said to have been thus abrogated.
(from Adam Clarke's Commentary, Electronic Database. Copyright (c) 1996 by Biblesoft)