What does each color mean spiritually?

Colours each have a spiritual—or moral meaning. 

It is the personal law of vibratory rates, which gives colour a value as an indication of advancement. 

Each colour has as its companion a personal tone, which is a harmonic of the colour value—or note. 

I find the terms familiar to you hard to use with any real effect. 

They have an entire vocabulary for this study of musical colour.

As you advance you add form as well—

You pass along normal evolutionary lines up the scale of colour—each step indicating growth—from simple primary to complex and delicate shadings, ever toward the centre and mother of all colour, which is light—vibrant—palpitating—life-giving light—a single ray, which is blinding to all, but perfected souls. 

You are born with some colour and tone dominating you.