Hex #66243f or rgb(102,36,63) in RGB space is the tint of scarlet. It has hue angle of 335.45 degrees, value = 40 and saturation = 65. #66243f can be obtained by mixing 4 colors: 5 drops of red, 4 drops of blue, 1 drop of white, 5 drops of black.
Nearest safe hex - #663333. Below you can see the block with #66243f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66243f to the mixer and play with it.