what defines the colour of the cards

[guy bannik]

so each sephirot has four colours, i got that far. But I read that also the 22 atu have their own four colours. based on what system where they chosen, what defines them? Do explain

 

[Alta]

No expert here! But I do know that they come from the Golden Dawn colour scales:

http://www.lelandra.com/tarotbook/TreeofLifeColors.htm

 

[brightcrazystar]

All the colors and meanings and scales are covered in book T and 777.

 

[Grigori]

There is a very useful thread in the Golden Dawn subforum that goes into th color scales in detail. http://tarotforum.net/showthread.php?t=96602