A "honing resistant" razor
I bought a new straight razor several days ago. This is my second razor (the other one i use for shaving). The purpose is to learn how to hone. It was used by previous a few times user and it's blunt (he gave up straight razor shaving...) However i can't see any cracks, scratches, chips etc. It slides smoothly over the thumbnail. I had 3 hones: 1000, 4000 and 12000 (can't get 8000 now). All of them were flattened. Firstly, i began honing on 1000 grit stone. I did 6..7 strokes and the razor seemed to be sharper (it was digging into the wetted thumbnail). Then i switched to 4000 grit hone. I did 30 strokes on it but can't feel any improvement in sharpness. It doesn't even cut my wet fingertip when using higher pressure ! I use very light pressure when honing and try to keep the edge lie flat on the hone. Because the razor blade is wider than the hone i use
X-pattern (it's very difficult though). I did additional 20..30 strokes on 4000 but the blade still seems to be very bluntl. It seems that there is certain level of sharpness that can not be exceeded. It doesn't cut hair on my forearm after honing on 4000.
Why is this ? Is it because of very hard steel that the razor is made of ? (but i'm sure i do something wrong but i can't find out what)