Hex #605900 or rgb(96,89,0) in RGB space is the tint of yellow. It has hue angle of 55.63 degrees, value = 38 and saturation = 100. #605900 can be obtained by mixing 2 colors: 3 drops of yellow, 5 drops of black.
Nearest safe hex - #666600. Below you can see the block with #605900 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #605900 to the mixer and play with it.