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US 2020/0046266 A1Published application
Methods and apparatus for visualising a print on an object
AssigneeThe Secretary of State for Defence
InventorsROBERTO STEFANO PASQUALE KING, PAUL FRANCIS KELLY, STEVEN GEOFFREY THORNGATE
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Abstract
The present invention provides a method for the production of a metal halide adduct of S4N4, in particular a specific copper adduct of S4N4, 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 S2N2 obtained from a metal halide adduct of S4N4.
Claims17
A method for the production of a metal halide adduct of S4N4 comprising the steps of.
- a. reacting S2Cl2 with gaseous ammonia in a dry solvent to produce crude S4N4;
- b. without purification, adding the crude S4N4 to a solution of metal halide in alcohol and stirring until no S4N4 remains;
- and
- c. obtaining the metal halide adduct of S4N4 by removal of the alcohol.
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An apparatus comprising:
- a first chamber comprising a heating element for heating a metal halide adduct of S4N4 to produce S2N2 vapour, the metal halide adduct of S4N4 having been produced by (i) reacting S2Cl2 with gaseous ammonia in a dry solvent to produce crude S4N4, (ii) without purification, adding the crude S4N4 to a solution of metal halide in alcohol and stirring until no S4N4 remains, and (iii) obtaining the metal halide adduct of S4N4 by removal of the alcohol;
- a second chamber in communication with the first chamber and in which an object potentially comprising at least one print can be arranged, the second chamber comprising a cooling element for cooling S2N2 vapour produced from the first chamber;
- and
- a vacuum pump in communication with the second chamber;
- wherein in use the S2N2 vapour is cooled in the second chamber at or proximal to the object, to facilitate interaction between the S2N2 vapour and the object.
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Dependencies are inferred from the claim text.