<Li> <P> A painted pottery pot coloured with Han blue from the Han Dynasty in China (206 BC to 220 AD). </P> </Li> <P> A painted pottery pot coloured with Han blue from the Han Dynasty in China (206 BC to 220 AD). </P> <Li> <P> A tomb painting from the eastern Han Dynasty (25--220 AD) in Henan Province, China . </P> </Li> <P> A tomb painting from the eastern Han Dynasty (25--220 AD) in Henan Province, China . </P>

Where did the term blue 42 come from