Hex #66335b or rgb(102,51,91) in RGB space is the tint of crimson. It has hue angle of 312.94 degrees, value = 40 and saturation = 50. #66335b can be obtained by mixing 4 colors: 2 drops of yellow, 4 drops of magenta, 4 drops of blue, 5 drops of black.
Nearest safe hex - #663366. Below you can see the block with #66335b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66335b to the mixer and play with it.