revision preference src: Around the time of Sauria's death, some 3 trillion of white phosphorus matches per year were produced worldwide. White phosphorus was soon proven to be toxic and banned by the international Berne Convention in 1906. <SEP> tgt: Around the time of Sauria's death, some 3 trillion of white phosphorus matches per year were produced worldwide. However, white phosphorus was soon proven to be toxic and banned by the international Berne Convention in 1906.