"Aye, it would all depend on how much the skin interferes with the ink... The ink would just be a drawing on canvas, so it'd be an inanimate object, but with a tattoo just bein' colored scar tissue... At least the Muggle ones." He frowned as he thought through it. "Ye might be able ta get 'round it if ye can just figure out a combination o' spells to make a permanent paintin' on yer skin, but then ye'd need ta reinforce the spells well 'nough that they couldnae be undo easily..."
Lacing his fingers together with Nate's, he nodded. "The intention debate. Obviously it doesnae work with everythin'. An unforgivable is still an unforgivable even if ye do it fer good reasons, but that's probably because ye still need ta want ta do that level o' harm in order ta successfully cast 'em... But aye, most magic is nae so black an' white on whether it's dark. The charm ye use ta cut fabric can easily become dark if ye use it ta cut apart people..."