O.S.M. Runic Print

Since I can no longer afford the ink cartridges for my printer (it would be cheaper to buy a new printer) I thought I re-visit potato printing...
Which failed due to the inferior quality of today's rubbish spud..
So...
A bit of hard-board and a few matches and about an hour of getting covered in black paint later I have a stack of sheets of paper printed with O.S.M. in runic form..
(I hope that's what is represents, probably means 'arse' or something similar...)
Now what am I to do with all these sheets of runic printing and how will I get the paint off my keyboard...?