Hex #99a91a or rgb(153,169,26) in RGB space is the tint of yellow. It has hue angle of 66.71 degrees, value = 66 and saturation = 85. #99a91a can be obtained by mixing 4 colors: 3 drops of yellow, 2 drops of red, 4 drops of green, 1 drop of white.
Nearest safe hex - #999933. Below you can see the block with #99a91a color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99a91a to the mixer and play with it.