192 Reddish Brown / Reddish Brown
BrickLink: Reddish Brown
Also known as New Brown, this color started replacing 25 Earth Orange around 2003 as part of the Great Color Change. This color has several variations, even appearing in the same part in the same set. The original Sandcrawler was a mess. LEGO seems to have gotten that under control now that they mix their own colors.
This color sometimes turns bright Dark Orange-looking under a UV light. If any test shows just how inconsistent the color is, it's this.