Becon
his weakness is every colour of the rainbow except green
Since every possible color is somewhere in the rainbow, it must follow that when light with two or more of the rainbow's colors mix, the mix may produce another color that's somewhere else in the rainbow.
Mystic topaz usually appears to display rainbow colours, with greens, blues and ... every single colour can be seen in one kaleidoscopic and magical stone.
Purple
Yellow
indigo
violet
the colour is rainbow.
Yellow
Red
Red
The colour that seven is equal to in Rainbow is violet.