english: And it's a pool that's too difficult to fully characterize, even by modern methods, and the product looks brown, like this tar here on the left. A pure compound is shown on the right, for contrast.
non_english: To je sistem koji je veoma teško potpuno okarakterisati čak i modernim metodama, i ti produkti su braon boje, kao katran prikazan sa leve strane. Da biste uvideli kontrast, sa desne strane je pokazano čisto jedinjenje.