Here is the image of the staining caused by pink flagging tape that will run in the News.
Apparently this is a more common problem than I thought. Val Hildreth, co-author of the NSS Conservation book and our Conservation chair, says its not uncommon to see tape bleed colors when placed on wet or intermittently wet flowstone. Joel DeSpain, who works for the park service as a cave specialist, concurred and mentioned having seen this in Lech. He's also seen it get calcited in on wet flowstone.
One solution Val recommends is to only use white (undyed) flagging on wet flowstone floors.
Click on the thumbnail below for a larger image; this flagging just removed was less than a year old: