Hex #868363 or rgb(134,131,99) in RGB space is the tint of yellow. It has hue angle of 54.86 degrees, value = 53 and saturation = 26. #868363 can be obtained by mixing 4 colors: 5 drops of yellow, 5 drops of red, 5 drops of blue, 4 drops of cyan.
Nearest safe hex - #999966. Below you can see the block with #868363 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #868363 to the mixer and play with it.