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  Raw Sienna (PBr7): a naturally occurring yellow-brown pigment from limonite clay.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.