Hex #d5331d or rgb(213,51,29) in RGB space is the tint of red. It has hue angle of 7.17 degrees, value = 84 and saturation = 86. #d5331d can be obtained by mixing 3 colors: 1 drop of yellow, 4 drops of red, 1 drop of blue.
Nearest safe hex - #cc3333. Below you can see the block with #d5331d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #d5331d to the mixer and play with it.