Hex #664e5e or rgb(102,78,94) in RGB space is the tint of crimson. It has hue angle of 320.00 degrees, value = 40 and saturation = 24. #664e5e can be obtained by mixing 4 colors: 4 drops of magenta, 1 drop of cyan, 3 drops of green, 2 drops of black.
Nearest safe hex - #666666. Below you can see the block with #664e5e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664e5e to the mixer and play with it.