BTW
This video was intended for knifes to see how fast stone release slurry on Kasumi knifes and what finish they give.
If i did it on razors effect will be much more different and you will not se any differens on video. That what is tricky with razors you will not see it but will feel it wile shaving That what is big differens for stones that intended for knifes or tools, or for razors that you can feel sharpness on your face !