turning steel black (actually called steel bluing) is a super easy but fascinating and very useful process. not only for rust prevention- but mostly for aesthetics.
Here is the steel bluing solution I used:https://www.ballistol-shop.de/Browning-Kit-of-50-ml-Quick-Browning-Ballistol-Cold-Degreaser_B-S_509.html
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The brands and friends I work with
https://www.festool.de
https://www.festool.co.uk
https://www.leatherman.com/de_DE/home