In 1955, the Aurora Borealis, a coating applied to crystal stones to produce a "rainbow of colors" effect was introduced.
The Aurora Borealis happened ten years after the end of the second world war.
( z1 event :name ( z2 name :op "Aurora" :op "Borealis" ) :time ( z3 after :op ( z4 end :ARG1 ( z5 war :name ( z6 name :op "Second" :op "World" :op "War" ) ) ) :quant ( z7 temporal-quantity :quant 10 :unit ( z8 year ) ) ) )