(57) Process for metal coating articles through the silver reduction reaction known as Tollens test, comprising the steps of:

a) applying, preferably spraying, over said article a layer of a preparative paint;

b) applying, preferably spraying, a gripping primer resin layer;

c) drying said primer layer;

d) forming a metal mirror over the article surface through the silver reduction reaction known as Tollens test;

e) washing with water the surface of the so treated article;

f) applying over the article surface a first transparent resin layer to form a first protection layer;

g) drying said first protection resin layer;

h) applying a second transparent resin layer to form a second film or layer as a protection against chemical agents;

Alternatively there is provided a step (f) of applying a single transparent protection layer by using a two-components acrylic-urethane resin.