glass or metal such as e g bottles which consists in covering at least partially said bottles with a coating imitating frost or ice crystals said coating is achieved from a solution of a particular polymer capable of forming patterns of the desired type during the steps contemplated by said method in fact the latter mainly consists in preparing first said bottles with a view to applying said polymer to this end a previous obscuring of the surface of the bottles is preferably performed preferably by means of a sand blasting under a pressure between 2 kg cm 2 and 4 kg cm 2 according to the brittleness of the bottles involved this first step is particularly important and the care taken in it determines the quality of the final result the obscuring will afterwards indeed allow each crystal particle to be attached to the treated surface in order to cover it with all its brightness accordingly it has to be carried out in a scrupulous way with extreme precautions the bottles are then cleaned by washing with water then dried and dusted by blowing still with care in order to optimize the formation of the desired frost crystals the method also contemplates conditioning the cleaned bottles for some period of time so as to bring them in determined physical conditions corresponding to those in which the polymerization reaction is likely to be carried out in the best way to this end before coating the bottles the latter are left for 24 h in a room in which is maintained a temperature between 4 u00b0 c and 6 u00b0 c after this step the application of a substance capable of polymerizing is proceeded to said application can be performed manually by means.