Digital BW, The Print

In December I printed a few 16x20 colour images on canvas. I used an Epson 4880 with all Epson colours and MIS blacks.

One of the prints was off a bit from the colour balance I wanted, so I set it aside in my darkroom, draped face down over a 35mm Saunder 4500 negative carrier that was on top of a few boxes of 8x10 paper.  I did not disturb it until yesterday, at which point I saw what looked like mildly viscous patches on the black surface of the negative carrier. They looked a bit like oil or glycerol. These deposits were not there when I set the print on the carrier.  The patches cleaned off easily with Windex.

Does anyone know what the substance was?  I was surprised that it had apparently moved from the ink to the metal carrier, and even more surprised that it still there four months after the print �dried�.

Myron