lover: you sound like a Belgian. they don't like case colors either, but prefer a pewter like appearance to their shotgun receivers.
exposure to direct sunlight seems to naturally fade case colors. ever notice how many guns from texas and other places south are void of case colors?
you might try naval jelly or sodium hydrosulfide. they are both strong oxidizers...
Yes prolonged exposure to UV will have a negative impact. HOWEVER, we are talking years. Why anyone would not at least use a case is beyond me. Case coloring will fade because of handling. Why any idiot would put naval jelly on a new gun is beyond me. Naval Jelly is infused with phosphoric acid!
Those "Texas" guns had obviously been heavily used and handled.
That "pewter" appearance can be achieved after a gun has been hardened by removing the case colors with toilet bowl cleaner aka dilute Hydrochloric acid. It is called a French finish. Ken Hurst uses that "trick". Or simply have the metal recase hardened using a product like Kasenit.
Pete
