Hex #664f60 or rgb(102,79,96) in RGB space is the tint of crimson. It has hue angle of 315.65 degrees, value = 40 and saturation = 23. #664f60 can be obtained by mixing 4 colors: 5 drops of red, 1 drop of magenta, 5 drops of cyan, 4 drops of black.
Nearest safe hex - #666666. Below you can see the block with #664f60 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664f60 to the mixer and play with it.