Since explaining it ingame is kind of tricky, here's a screen of how to setup colored text.
This text color will only work if used from your main chat tab (whichever is set to show /say).
If you type '/say [text]' from your guild tab or any other such channel, it will show up white.

Decimals as well as whole numbers can be plugged in to tweak hues even more. See the example below:



Have fun, tis a neat little code to personalize your conversation. ^ ^