There are other fascinating pigments in this package but for now let's look at these gorgeous burnt umbers. They all are of a fine grind--I can't feel any grit while dispersing.
|Reddish Type B Dark Brown|
Here are the details:
Umbers have the same iron oxide component as the ochres and siennas. Only thing is that umbers also contain manganese which means that a bit of added attention is needed. If the usual precautions are taken, there's no problem.Burnt Umber Reddish, Italy (40700)Burnt Umber Type B, Cyprus (40723)Burnt Umber Dark Brown, Cyprus (40720)
[pigment name, origin, (Kremer #)]
From what I've been reading, the manganese acts as a drying agent with oils and artists sometimes mix a bit of umber for that purpose.