Picture a small sea animal that hides by squirting out a cloud of dark brown liquid. People once caught that liquid, dried it, and wrote and drew with it. Every use of sepia can be traced back to that one brown: the ink in the bottle, the animal it came from, the colour of the dried ink, and the old pictures that end up wearing that colour.
From the word’s history
English borrowed sepia from Latin sepia, which meant cuttlefish, and that came from Ancient Greek sepia. So the word began as the name of the animal, then moved to its ink, and then to the colour of that ink.
英文的 sepia 借自拉丁文 sēpia，意思是「墨魚」，再往前是古希臘文 σηπία。所以這個字一開始是動物的名字，接著跑到牠的墨上，最後才變成那個顏色的名字。
Wiktionary entry 'sepia' (packet etymology_text; source_ref kaikki:3f6f69a190036ae4:133145396:16621)
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