可以參考下 The Writing Desk的Martin的說法
OK folks, here's the run-down:
Diamine Umber is made of a mixture of green and brown. However, as we have all seen, the green is dominant. According to Diamine, the origin of this blend is most likely to be a customer request as it isn't on their regular "shade card".
Diamine's recipes are really quite old so this particular customer request could have been made 100-years ago. Unfortunately, no records exist to give any further background as to its origin or naming.