Hex #667b2b or rgb(102,123,43) in RGB space is the tint of lime. It has hue angle of 75.75 degrees, value = 48 and saturation = 65. #667b2b can be obtained by mixing 4 colors: 3 drops of red, 1 drop of blue, 5 drops of green, 1 drop of white.
Nearest safe hex - #666633. Below you can see the block with #667b2b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667b2b to the mixer and play with it.