Color is not claimed as a feature of the mark.
The mark consists of a circle with a thick outline, inside the circle at the top reads "IRON BILL" in an arch following the inside of the circle. In the center are 2 fire axes that are crossed at the handles forming a "X". At the top of the crossed axes is a Maltese cross reading "H" "F" "D", each letter in a one of the first 3 sections of the cross, with a "68" in the fourth section of the cross. To the left of the crossed axes says "Houston", to the right of the crossed axes reads "Texas", and in the bottom of the crossed axes reads "Capt. Dowling".