Our archival safe photo Signature pen is acid free and a pen that can be safely used not only on the backs of photographs but also on the front. Acid free ink should be used not only for protecting your photographs but also for the longevity of what you have written.
Using normal non acid free ink can not only harm your photographs and documents but the ink will almost certainly fade and not preserve your information for long term.
We have just secured a large order of these pens from the Manx Museum on the Isle of Man http://www.gov.im/mnh/heritage/museums/manxmuseum.xml
Certainly archivists and museums etc know how to safely archive documents, photographs and artifacts. If you have any questions on preserving your Family History please contact us or visit our Archiving section at