Hex #66672b or rgb(102,103,43) in RGB space is the tint of yellow. It has hue angle of 61.00 degrees, value = 40 and saturation = 58. #66672b can be obtained by mixing 4 colors: 4 drops of red, 1 drop of blue, 1 drop of cyan, 4 drops of green.
Nearest safe hex - #666633. Below you can see the block with #66672b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66672b to the mixer and play with it.