I'm a green and purple gradient. 

two colours, simple, no compromise, no mix? 

I stood at my reflection and stared into my colours,

Yellow and blue made my green

A punch of red made my purple

So I'm a red, yellow, and blue mix, then a green and purple gradient.

I stared into the looking glass more, 

There was pigment, my green felt bright, my purple felt dark.

The mystery of black and white made the lightings of my colour collage.

So I'm a white and black pigmentation of red, yellow, and blue mix, then a green and purple gradient.

I thought I knew, that's all right?

My mother likened my white to the clouds,

My father said the black was as crude as earthen oil,

A man told me my red was more of wine,

Another woman said my yellow looked like the sun,

A child said my blue was as deep as the sea,

A friend called me leafy green, and the one I loved called my purple magenta.

So really what am I?

What shall I call myself?

Colours are not always as they seem but how they are displayed.

My colours are my life, so I'll carry whatever shade, royal or sky, crimson or wine, dark or bright...

I, therefore, live.