Simpliest way to send a colored message is to send a SayText message.
Code:
message_begin(MSG_ONE, gMsg_SayText, _, id)
write_byte(id) // team color based on this player
write_string(szText)
message_end()
Use ^x04 for green, ^x01 for normal color and ^x03 for id's team color.
If that's not enough then search for the colorchat stock.
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