Hello,
I would avoid graphite because of its tendency to smear. Of course,
future historians may find it useful to have your finger print right
on the print or is it your customer's finger print. ;-)
Graphite is carbon compound consisting of flat, closed molecules that
slip and and slide across each other - sort of a cross between coal
and petroleum. For some machinery it is used as lubricant.
Much better to use high quality artist's color pencils - also
available in black and browns. These pencils are made of clay, a weak
binder, such as tri-methol cellulose, and the pigment. Even though
you can still smear your signature - if you work at it, it is easier
to clean up with plastic eraser. Use a sharp point and press down to
impress your signature in the paper.
You may also want to protect your work with a copyright notice. I
find something like, MyName C 2003. Where the C is located goes the
copyright symbol.
[A quick way to get the copy right symbol is to use the utility,
Character Map in Accessories|System Tools on Windows. I can paste it
into Photoshop and usually most fonts map it correctly. When I pasted
the copyright symbol, Ó, in this message, it mapped into a funny
symbol with the font yahoo is giving me to reply to this email.]
Hope this helps,
Lincoln