Thanks Ernie. For anyone interested, the article including pictures can be found online here: http://www.crime-scene-investigator.net ... print.html
After brainstorming and talking with some people in the office, I've come up with the following:
Indirect NIN (place the item in a bag with another NIN soaked paper and let it absorb the fumes)
Indanedione (although that's just a NIN analogue, so.....)
Zinc Chloride. (I'd have to check to see if we have that)
If anyone wants to provide feedback on these ideas, feel free.
Also, for what it's worth, the paper is a carbonless copy of a receipt.