In 1955, the Aurora Borealis, a coating applied to crystal stones to produce a "rainbow of colors" effect was introduced.
A rainbow never has a pot of gold.
The pot of gold is a myth, and rainbows are created by water and sunlight.
( z1 have :polarity - :ARG0 ( z2 rainbow ) :ARG1 ( z3 pot :cxnsistof ( z4 gold ) ) :time ( z5 ever ) )