Hex #333333 or rgb(51,51,51) in RGB space is the tint of red. It has hue angle of 0.00 degrees, value = 20 and saturation = 0. #333333 can be obtained by mixing 2 colors: 1 drop of white, 4 drops of black.
Nearest safe hex - #333333. Below you can see the block with #333333 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #333333 to the mixer and play with it.