Hex #55281d or rgb(85,40,29) in RGB space is the tint of orange red. It has hue angle of 11.79 degrees, value = 33 and saturation = 66. #55281d can be obtained by mixing 3 colors: 1 drop of yellow, 1 drop of magenta, 4 drops of black.
Nearest safe hex - #663333. Below you can see the block with #55281d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55281d to the mixer and play with it.