Hex #667f50 or rgb(102,127,80) in RGB space is the tint of olive. It has hue angle of 91.91 degrees, value = 50 and saturation = 37. #667f50 can be obtained by mixing 4 colors: 3 drops of yellow, 3 drops of magenta, 4 drops of blue, 5 drops of green.
Nearest safe hex - #666666. Below you can see the block with #667f50 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667f50 to the mixer and play with it.