Hex #667f6c or rgb(102,127,108) in RGB space is the tint of bluish green. It has hue angle of 134.40 degrees, value = 50 and saturation = 20. #667f6c can be obtained by mixing 4 colors: 4 drops of red, 2 drops of magenta, 5 drops of cyan, 4 drops of green.
Nearest safe hex - #666666. Below you can see the block with #667f6c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667f6c to the mixer and play with it.