I sometimes runs scripts with the intent to see what's going on, using: sh -vx ...
If during the execution /etc/init.d/tc-functions gets sourced, all further output comes out in bold white. This is due to the fact that the definition of WHITE is the last one of the ANSI colors.
I guess this effect could be avoided, if the order of these definitions would be changed slightly and the defintion of NORMAL would be put at the end of that sequence.
This is not really a bug, and I consider it as purely cosmetic. One the other hand I can't see that such a change would cause any other problems.