Digital BW, The Print

"When I sign the mat I use a number 2 pencil, if on the print or the 
back of the print I use an ultra-fine Sharpie."

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I would not use Sharpie, as they are prone to fading. My wife created a 
piece of art in the form of her hand blown up to a huge size on canvas. 
The hand is white surrounded by black. The texture of the hand - every 
single line of her hand and finger prints and all the folds and texture 
of the skin - are written in as very small sentences which form a 
diary. Unfortunately, she wrote the diary in with a fine Sharpie and it 
is fading very badly.

Instead, I would use a black pigment ink-based drafting pen, such as 
Staedler.

Paul G.