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.
Raw umber has a greenish-brown masstone in which the green shows through well when used in thin layers such as watercolor washes. When used thickly, especially in oil paints, umber will look to be a very dark, almost black, cool toned brown. The problem with using pigment names to name inks is that pigments have very different properties when used in different ways, even if it is chemically the same compound.
An additional problem with a pigment such as umber is that it is traditionally an earth pigment, and unlike synthetics, they have a very wide range of properties and colors depending on where it came from. Earth pigments were traditionally derived from dirt and clay collected from various locales. Because of this, different umbers tended to have slightly differing properties.
Umber as a pigment is traditionally has a slightly greenish-brown mass-tone, and it seems that diamine umber was formulated to somewhat imitate unsaturated watercolor washes done with the pigment umber, rather than the same pigment densely saturated in, say, oil or acrylic, which the vast majority of people would think of when they imagine pigments and paints. The particular umber they compared it to probably had a slightly more green than is typical. Then again, the ones who named the colors could just have made a mistake.
。曾经怀疑过是瓶盖配错了，但网上的图片也是一样的颜色无误，真让人搞不明白。
