First, it will not allow me to see that link without a password. Second, if you will read thru the thread, you will see that I already posted a link for the chemical comp of mollusk ink. :)
Yeah....I saw that later. Evidently, it’s the melanin that gives it the color.
That wouldn’t mean that the melanin is still intact in the fossil....could be degraded...depolymerized...I don’t know enough about melanin to know what gives it “pigment” qualities.