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Until 1980, when pieces of Japanese embroidery were exhibited at the national seminar of the Embroiderers' Guild of America in DalIas, Texas, its embroidery was hardly known outside Japan. One of the things that makes Japanese embroidery unique is the fact that it uses silk threads that come in up to 500 different colors. The pattern, the season and the age group of the person who will use the finished product all come into consideration when choosing the right colors.