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The blade edges in my first M7DS are now approaching perfection so I am thinking of a new challenge.

I have two SR's that are effectively identical except for their steel hardness, so I am thinking about trying to determine how important is steel hardness when it comes to a blade holding its edge. These two SR's are:

I intend to first determine the edge holding ability of the T.H.70. To do this, I will alternate between each of the two razors for each day's shave. The T.H. 60 will receive its normal maintenance while the T.H.70 will receive no maintenance (no leather or balsa stropping) except for oiling. Pre-shave prep will remain the same for each shave. Once the T.H.70 becomes noticeably less comfortable to use compared to the T.H. 60, I'll call it quits with the T.H.70.

Once the T.H.70 is done with, I will swap it out for another T.H.60 that I have that shaves as well as my reference T.H.60 and repeat the process.

Results will be posted in this thread.

Looking to start this little experiment next Monday. Are there any suggestions for improvements?

I have two SR's that are effectively identical except for their steel hardness, so I am thinking about trying to determine how important is steel hardness when it comes to a blade holding its edge. These two SR's are:

- Titan 1918 AMRM-2 T.H.60 with a measured hardness of 59 RHC and a bevel angle of 18.6deg.
- Titan 1918 ACRO T.H.70 with a measured hardness of 68 RHC and a bevel angle of 19.1deg.

I intend to first determine the edge holding ability of the T.H.70. To do this, I will alternate between each of the two razors for each day's shave. The T.H. 60 will receive its normal maintenance while the T.H.70 will receive no maintenance (no leather or balsa stropping) except for oiling. Pre-shave prep will remain the same for each shave. Once the T.H.70 becomes noticeably less comfortable to use compared to the T.H. 60, I'll call it quits with the T.H.70.

Once the T.H.70 is done with, I will swap it out for another T.H.60 that I have that shaves as well as my reference T.H.60 and repeat the process.

Results will be posted in this thread.

Looking to start this little experiment next Monday. Are there any suggestions for improvements?

Last edited: Jul 21, 2020