A rainbow is rain acting as a prism breaking out the frequencies of 'visible' light. So, the colors in a rainbow are the true colors of light. True colors are red, orange, yellow, green, blue, indigo, and violet.
Observing your surroundings the colors you see are 'reflected' light frequencies. That is, if something looks red, it's really the NOT red light frequency bouncing back to your eye, other colors are absorbed. Get it?
Pink is not on any rainbow. Pink is made from two colors on opposite sides of the rainbow - red and violet. Our brains make pink because our eyes and brains can't cope with reflected light very well.
Any color not on the rainbow is a 'figment' literally of your imagination. And that includes your Barbie dolls girls.
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