While going through some bulk Lego for inventory I came across something different.
In my bin of "Arm Mechanical, Straight with Clips at 90 degrees (Vertical Grip)"
Item No. 59230, I have one that is similar to the tan ones, but obviously different.
When comparing the color to those in Bartneck's Color Guide, it appears
to be more of a "yellowish tan". Did Lego have two different tan's? Or
does tan age toward orange? Or is there another color not noted on that item?