I have just finished polishing a pair of Taylor razors I got from eBay a matching set with box. I notice that some of the lettering on the blade is black and some is not. I suspect that it was all black once up on a time.

How do I make the letters black again, I intend to use these razors once they are finished, so a permanent solution would be best, I don't want it to wash off.

Many thanks.

Peter