How do you open an old razor?

There are two things 1 is the grinding stone very fine kind of hand feel basically like marble like grinding stone. 2 is the yellow mud block yellow mud block is to increase the friction

The way to open the edge of the knife is to use a small amount of water poured on the grinding stone finished will be the yellow mud block in the grinding stone to play (draw) circle grinding stone on the mud should be dry and thin really good in order to do not flow does not dry out as good

First grinding the knife's front that is, the handle of the knife to the right knife like the front of the knife on the grinding stone to be placed on the horizontal front 20 times finished reverse 10 times

Finish with a cloth to file out the mouth

to be able to shave the razor.