[El Sordo]

Give this a little time.

It was probably identified through preliminary assemsment of level and type of radioactivity as well as color (Pu goes from green to pink depending on level of enrichment. But, it's been a while so don't hold me to that).

The men in the field are making rough estimates based on superficial info. A sample was probably winging its way to a proper test facility within an hour of discovery. Let's see if it pans out.

[aruanan]

It was probably identified through preliminary assemsment of level and type of radioactivity as well as color (Pu goes from green to pink depending on level of enrichment. But, it's been a while so don't hold me to that).

Plutonium, warm because of energy released in alpha decay, is a silvery metal that takes on a yellow tarnish in air.

Chemically reactive, it dissolves in acids and can exist in four oxidation states as ions of characteristic colour in aqueous solution: Pu3 +, blue-lavender; Pu4 +, yellow-brown; PuO+/2, pink (?); PuO2+/2, pink-orange.

--Encyclopedia Britannica

I believe that enrichment, in the context of nuclear weapons, is referring to uranium.