Tom
The worst bruises I have been left with to date were from a riding crop, they went through all the shades of the rainbow before settling to a slowly deminishing yellow. Although, personally, the cane hurt me more the welts quickly faded from angry red where as I had a much longer reminder of where the crop had been. You will have to ask my Master in what formation he gave the strokes and with what power as I was floating in sub-space at the time! Best of luck leaving your mark!!