I believe it should be rather simple to tell. The two are either
insufficiently oxygenated blood and silver deposits.  If you warm and massage
the hands the blue should decrease,and if the hands are cold it should
increase if due to oxygen deprevation.  If the shade and color remains
unchanged I think it will be due to silver deposits.

Try this.  Rub a finger, sepecially outward to force new blood to the end of
the finger.  The nail will turn bright pink, but the blue is still there for
me. That means that it can't be a problem with lack of oxygen, since I have
pink and blue at the same time (in fact that area turns violet from the
combination and the rest of the nail turns bright pink), instead the blue
should go away and be replaced by pink.

Marshall

Ode Coyote wrote:

>   There are many reasons one may have fingernail blue moons that have
> nothing to do with silver.
>
> Ode
>
> At 07:31 PM 11/9/2004 -0700, you wrote:
> >Is the blue right in the moon itself that should look white?
> >
> >TIA,
> >sol
> >
> >[email protected] wrote:
> >
> >> In a message dated 11/9/2004 9:01:00 AM Pacific Standard Time,
> >> [email protected] writes:
> >>
> >>     believe the bluing in my nails may be
> >>     > lightening.  I will know for sure probably in the next couple of
> >>
> >> I also have blue finger nails.  I show (blue) moons in all five nails.
> >>
> >
> >
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