On Thu, 12 Nov 2015 20:49:11 -0600, Martin Eastburn
wrote:

I'd put it under a microscope or eye lope.

It might be a heavy mineral like Lapus, or some of the coppers.
It needs to be examined by a pro or just yourself. It might
be a composite mixture like a sealing that is covering up something
nasty like tracer bullet. Burn anything.

I'd be careful, but likely it has been already been iD'd by doctors
or else. Maybe not if in the field...

We need more than color and a bullet - German is a big hint - all
sorts of this and that were tried.

Might be a sniper ID. Our bullets are marked with outside rings of
color and some colors indicate core content. But our bullets are FMJ.

Martin

I believe that the German WW II ammunition was also full metal jacket.
But the Germans also used a color coding and blue was used to identify
some lots of armour piercing munitions, although in the examples I've
seen it was marking on the cartridge base, not the bullet.

On 11/12/2015 12:04 AM, wrote:
A friend has the bullet that was removed from his dad in WW II. 8mm
German; it has a blue core. What would that core be?

--
cheers,

John B.