Hex #66795b or rgb(102,121,91) in RGB space is the tint of grass green. It has hue angle of 98.00 degrees, value = 47 and saturation = 25. #66795b can be obtained by mixing 4 colors: 4 drops of yellow, 5 drops of blue, 2 drops of white, 4 drops of black.
Nearest safe hex - #666666. Below you can see the block with #66795b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66795b to the mixer and play with it.