abstract |
The present invention provides a method for the production of a metal halide adduct of S 4 N 4 , in particular a specific copper adduct of S 4 N 4 , for the visualisation of a print on an object, in particular a fingerprint on a metal object. The present invention also provides a method and apparatus for visualising a print on an object, using S 2 N 2 obtained from a metal halide adduct of S 4 N 4 . |