You can use color codes by using this line:
|c00RRGGBB (text) |r
"|c" obviously stands for "color", and "|r" stops the color-code.
The first 2 digits ('00') are actually transparency (hexadecimal value), but they're useless. Some people use "ff" instead, I think '00' looks more elegant - you can do whatever you want with it though
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Then "RR" stands for the red value (hexadecimal).
"GG" stands for the green value (hexa) and "BB" stands for the blue value (hexa).
The value is calculated as follows: multiply the first digit by 16, then add the second digit to it.
So "B8" gives (B * 16) + 8 - B in hexa is 11, so that's (11 * 16) + 8 = 184.
Any image editor comes automatically equipped with something to convert colors to a hexadecimal code though