I gather that one can then put them in the freezer and the ink will reappear - along with all the crossings-out of course. I've never actually tried this, but r

I gather that one can then put them in the freezer and the ink will reappear - along with all the crossings-out of course. I've never actually tried this, but really must. Also, remember to have a normal biro or fountain pen for signing important documents!