Hex #554b00 or rgb(85,75,0) in RGB space is the tint of yellow. It has hue angle of 52.94 degrees, value = 33 and saturation = 100. #554b00 can be obtained by mixing 3 colors: 4 drops of red, 5 drops of green, 3 drops of black.
Nearest safe hex - #663300. Below you can see the block with #554b00 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #554b00 to the mixer and play with it.