Chen turned back to the box and examined the picture through the glass. White smudges were appearing on the front and back surfaces of the photograph, but he still had a long way to go. Fingerprints were nothing but sweat. After the water evaporated, an organic residue was left. The fumes from the superglue reacted with the amino acids, glucose, and peptides in the organics to form a white goo, but growing the goo took time. John figured he still had another ten or fifteen minutes before the prints would be usable.