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Oil from my hand must be a mix of sebum, sweat, salt, and dirt. While sebum is useful the rest of the ingredients are not.

I supposed that pure lanoline could be useful because it is produced from...

I agree.
In fact, I use the maintenance fat only for my custom made strops.

I would like to know what kind of substance is this dovo tube (yellow tube) used for strop maintenance.

I know its kind of fat, but what exactly?

And the real questions are:
Can I...