Hex #664f5b or rgb(102,79,91) in RGB space is the tint of scarlet. It has hue angle of 328.70 degrees, value = 40 and saturation = 23. #664f5b can be obtained by mixing 4 colors: 2 drops of red, 4 drops of magenta, 4 drops of blue, 5 drops of green.
Nearest safe hex - #666666. Below you can see the block with #664f5b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664f5b to the mixer and play with it.