Can I use it on chrome?
Yes, it works brilliantly on chrome, stainless steel, aluminium and other bright metals.
Does it protect the metal?
It leaves a light protective layer of oil behind but you can top it with wax or sealant for longer protection. Give the metal a solvent wipe with Stripp-Ex before applying sealant to maximise the adhesion.
Will it scratch delicate metals? And what about plating or veneers?
It is unlikely to mark even the softest metals as it breaks down when worked but test on an inconspicuous area if worried. Be careful with thin metal plating or veneer though - it will remove material and could remove too much.
Why does the cloth go black when polishing?
When metal is removed it looks like a fine black powder under the microscope. You are removing an old metal finish to reveal a fresh metal surface beneath.