Gdk::Color(ffffff) is allmost black

[Antonio Coralles <noche suapie reflex at>]

in the documentation at 
http://www.gtkmm.org/docs/gtkmm-2.4/docs/reference/html/classGdk_1_1Color.html#a0 
about
Gdk::Color::Color(const Glib::ustring& value)  is written:
1.) "The text string can be in any of the forms accepted by XParseColor"
          the documentation for XParseColor (for example 
http://www-aix.gsi.de/~bio/DOCS/X11R6DOCS/X11/XQueryColor)
           says that strings like
               rgb:/<red>/<green>/<blue>//
                       <red>/, /<green>/, /<blue>/ := /h/ | /hh/ | 
/hhh/ | /hhhh/ /
                           h/ := single hexadecimal digits (case 
insignificant)
           are valid.
           so my assumtion was that Color("rgb:ff/ff/ff") should be 
white .... but it's allmost black too.
           the docu for XParseColor says also, that for backward 
compatibilty strings like
               #RGB                  (4 bits each)
               #RRGGBB          (8 bits each)
               ....
           are valid too, and yes Color("#ffffff") is white as it should.
2.) "... or a hex specification such as 305050" well, Color("305050") is 
just the same dark stuff (yes, it should be dark), while
      Color("#305050") looks a bit brighter; indeed, as you might guess 
Color("ffffff") just looks like Color("305050")

i know that's just bagatelle, because i get all the colors i want with 
#...., and mostly a simple Color("white"),  Color("blue") is all i need, 
but if i didn't  misundersood something really badly there may be a bug 
in the documentation or eaven the library (i'm still using 2.4.5) ... [i 
hope i haven't ignored a section in the gtkmm book again :-)]