Hex #665f1a or rgb(102,95,26) in RGB space is the tint of yellow. It has hue angle of 54.47 degrees, value = 40 and saturation = 75. #665f1a can be obtained by mixing 4 colors: 3 drops of yellow, 1 drop of red, 1 drop of cyan, 5 drops of black.
Nearest safe hex - #666633. Below you can see the block with #665f1a color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #665f1a to the mixer and play with it.