this code will do red to blue:
code:
[c=4]Red Text to Blue[/c=12]
if you want to do different colours in the chat window find a format icon that looks like a heap of different colours, then hit the T in the top right corner of the new window and select Gradient Text, then select the first colour you want to have, and then the second.
if you would like a script that can automatically do this for you try
Message Customizer! Live
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