Back in the old days, Gillette made the Blue Blades, carbon steel blades, that can rust. At some point, they started making blades from Stainless. I have used Treet Carbon steel blades, and find them to be uncomfortable. Has anyone used a blue blade by Gillette? My thoughts are that they would have microscopic rust and not give a very good shave. Also, given that the Treet Blades are not as good as the stainless options we have available today, was shaving as pleasurable when all that was available were the Carbon Steel Blades? What are your thoughts?