I'm looking at producing some larger fine art pieces printed on metal (there are a few pro vendors which do this). If I wanted to sign these pieces (on the front, in the corner), does anyone know of a type of pen that could be used which won't damage the art and will hold up over time?
A standard 'Sharpie' permanent marker contains acid, but..
Sharpie lists on their website a few ones that are 'acid free' and for 'archival quality', those should be fine.
We debated this on digital grin once, and came to two conclusions:
Answer received from a customer service supervisor at Bay Photo, one of the leading vendors which does metal prints:
...we have tested many types of markers and pens on our metal prints. We have found that the Bic Mark-it works the best. It is permanent and does not rub off.
I find even fine point sharpie too broad and does not distribute evenly therefore looking for an alternative