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.
水たまりに たまった茶色の タール状の生成物は 現代的な方法でも 完全には分析できません 右側に置いてある純粋な化合物と 比べてみてください