In this video, I talk in detail about how to create beautiful gradient light on a flat shiny object. I start by discussing how to create a gradient on the non-shiny background to give everyone a good base of understanding. Then I move on to discussing how to use a diffusion panel to create a gentle gradient on a Helle knife blade.
(The one I am using is by fotodiox but are no longer available)
Rosco Diffusion Filter Kit, 12 x 12 Sheets
Paul C. Buff Einstein Strobes used