From the Grohmann website:
"Tung oil or boiled Linseed oil applied to dried rosewood handles helps their appearance."
I'd imagine both would be fine for starters.
https://www.grohmannknives.com/index.php/customer-service/safety-tips
"Tung oil or boiled Linseed oil applied to dried rosewood handles helps their appearance."
I'd imagine both would be fine for starters.
https://www.grohmannknives.com/index.php/customer-service/safety-tips