Hex #551839 or rgb(85,24,57) in RGB space is the tint of scarlet. It has hue angle of 327.54 degrees, value = 33 and saturation = 72. #551839 can be obtained by mixing 3 colors: 1 drop of red, 1 drop of blue, 1 drop of black.
Nearest safe hex - #660033. Below you can see the block with #551839 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #551839 to the mixer and play with it.