after some tests
: can be removed with open incomplete color tag at the end of the nik name
^c-FF - (only 2 hex values for color - but it is allowed by the game)
^c-FFF
^c-FFFF ...etc...
even if one letter is added after it - game still not able to fix it ...
only 2 letters fixing the tag...
so
^c-FFR - (2 hex and 1 none hex letters)
^c-FFFR
still invalid tags...
with second letter present - game is able to fix it ..(although : will be colored still by the last open tag.....but messages after - should not be affected)
thus
^c-FFFRR - is already valid tag.. - (3 hex letters and 2 none hex)
I've blocked all invalid combinations i found invalid so far ...
Player will get short ban for 5 sec with message "Invalid Tag - Please remove color tag at the end"