Hex #66185b or rgb(102,24,91) in RGB space is the tint of crimson. It has hue angle of 308.46 degrees, value = 40 and saturation = 76. #66185b can be obtained by mixing 4 colors: 3 drops of red, 3 drops of magenta, 5 drops of blue, 4 drops of black.
Nearest safe hex - #660066. Below you can see the block with #66185b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66185b to the mixer and play with it.