/etc/X11/app-defaults/XClock-color is in x11-apps 7.7+5+nmu1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | ! $XFree86$
#include "XClock"
XClock.Clock.hourColor: rgba:7f/00/00/c0
XClock.Clock.minuteColor: rgba:00/7f/7f/c0
XClock.Clock.secondColor: rgba:00/00/ff/80
XClock.Clock.majorColor: rgba:7f/00/00/c0
XClock.Clock.minorColor: rgba:00/7f/7f/c0
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