before being laminated between sheets of glass an extruded film about 765 micrometers thick comprising in parts by weight 3 1 parts nickel bromide hydrate 3 7 parts 1 pentylbenzimidazole 11 9 parts tetrabutylammonium bromide 0 5 parts water 9 9 parts 2 butyl 2 ethyl 1 3 propanediol 1 4 parts stabilizers 7 9 parts triethyleneglycol bis 2 ethyl hexanoate and 61 6 parts polyvinylbutyral was prepared a portion of this film was laminated between two pieces of 3 mm clear float glass and portions of this film were used in examples 15 21 22 23 and 24 an extruded film about 765 micrometers thick comprising in parts by weight 3 1 parts nickel bromide hydrate 3 7 parts 1 pentylbenzimidazole 0 1 parts neocuproine 12 0 parts tetrabutylammonium bromide 0 4 parts water 9 9 parts 2 butyl 2 ethyl 1 3 propanediol 1 4 parts stabilizers 7 7 parts triethyleneglycol bis 2 ethyl hexanoate and 61 7 parts polyvinylbutyral was prepared a portion of this film was laminated between two pieces of 3 mm clear float glass and a portion of this film was also used in example 16 an extruded film about 765 micrometers thick comprising in parts by weight 3 2 parts nickel bromide hydrate 3 8 parts 1 pentylbenzimidazole 0 001 parts keyplast red 2g 11 9 parts tetrabutylammonium bromide 0 4 parts water 9 9 parts 2 butyl 2 ethyl 1 3 propanediol 1 4 parts stabilizers 7 7 parts triethyleneglycol bis 2 ethyl hexanoate and 61 7 parts polyvinylbutyral was prepared a portion of this film was laminated between two pieces of 3 mm clear float glass and a portion of this film was used in example 17 an.