just find where it is in your code and add a colorcode.
Do a grep in your src directory.
Code:
grep -l "glows with a bright light" *.c
it will show you that the string is located in act.informative.c
edit the file, find the location of the code you need. In stock tba its around line 337 and add a colorcode. you can find in-game colorcodes with "help colorcodes" in game.
here is the code from act.informative.c unchanged.
Code:
if (AFF_FLAGGED(i, AFF_SANCTUARY))
act("...$e glows with a bright light!", FALSE, i, 0, ch, TO_VICT);
Change it to something like this:
Notice the @W and @n below. this is to start a bright white and then terminate it at the end of the string.
Code:
if (AFF_FLAGGED(i, AFF_SANCTUARY))
act("@W...$e glows with a bright light!@n", FALSE, i, 0, ch, TO_VICT);