it had been a complicated picture to color , and as bree had just got to the phase where she insisted that things be colored `` real , '' the cannon could not be pink or orange , and frank had obligingly drawn several crude cannon on a sheet of paper and tried out everything from gray ( with shadings of black , blue , blue-violet , and even cornflower ) to brown , with tints of burnt sienna and gold , before they finally settled-frank 's opinion as to actual historicity of cannon being diffidently advanced-on black with dark green shadings .