do u know ^k means ctrl+k ?
do you using mIRC that support ctrl+k 99
^k1=red
^k1^k2^k3^k4^k1=black
the control code is parsed by mIRC, so it won't be visible.
the bot is not written by me, but it works perfectly that only 2 bot using the right script will see the virutal nick
as it's named virtual nick, not real color nick

and sorry for the first poster: iceblade
i don't meant to such far off topic
just telling that an existing bot can make use of color nicklist, if miRC support it