Hex #667d4d or rgb(102,125,77) in RGB space is the tint of olive. It has hue angle of 88.75 degrees, value = 49 and saturation = 38. #667d4d can be obtained by mixing 3 colors: 4 drops of red, 3 drops of cyan, 3 drops of green.
Nearest safe hex - #666666. Below you can see the block with #667d4d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667d4d to the mixer and play with it.