Hex #667b6c or rgb(102,123,108) in RGB space is the tint of bluish green. It has hue angle of 137.14 degrees, value = 48 and saturation = 17. #667b6c can be obtained by mixing 4 colors: 3 drops of red, 5 drops of blue, 4 drops of green, 3 drops of white.
Nearest safe hex - #666666. Below you can see the block with #667b6c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667b6c to the mixer and play with it.