1 Coil (chemistry), a tube used to cool and condense steam from a distillation.  Coil spring, used to store energy, absorb shock, or maintain a force between two surfaces.
Umber RGB Color Code: #635147. The hexadecimal RGB code of Umber color is #635147. This code is composed of a hexadecimal 63 red (99/256), a 51 green (81/256) and a 47 blue component (71/256). The decimal RGB color code is rgb(99,81,71).
Clay earth pigments (naturally formed iron oxides). 1  Raw Umber (PBr7): a natural clay pigment consisting of iron oxide, manganese oxide and aluminum oxide: Fe 2 O 3 + MnO 2 + nH 2 O + Si + AlO 3. 2  When calcined (heated) it is referred to as Burnt Umber and has more intense colors.he following list includes commercially or artistically important inorganic pigments of natural and synthetic origin. The only dyes listed are derived directly from inorganic pigments.