Hex #a4ac5b or rgb(164,172,91) in RGB space is the tint of yellow. It has hue angle of 65.93 degrees, value = 67 and saturation = 47. #a4ac5b can be obtained by mixing 4 colors: 4 drops of yellow, 1 drop of green, 5 drops of white, 4 drops of black.
Nearest safe hex - #999966. Below you can see the block with #a4ac5b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #a4ac5b to the mixer and play with it.