Hex #553639 or rgb(85,54,57) in RGB space is the tint of red. It has hue angle of 354.19 degrees, value = 33 and saturation = 36. #553639 can be obtained by mixing 4 colors: 2 drops of red, 2 drops of blue, 1 drop of green, 1 drop of black.
Nearest safe hex - #663333. Below you can see the block with #553639 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #553639 to the mixer and play with it.