english: It turns purple from the presence of numerous microbes which have to have sunlight and have to have hydrogen sulfide, and we can detect their presence today -- we can see them -- but we can also detect their presence in the past.
non_english: İçinde güneş ışığı ve hidrojen sülfid bulunduran bazı mikroplar ki biz bunların görünüşünü geçmişten bu yana biliyoruz mora çevirir.