The signature on a fantastic autographed photo of Winston Churchill at Chartwell, which a friend framed and kept on his wall and hid from the light, has faded to nothingness. Even ambient room light will fade ancient inks, and there is nothing to be done.
Back when I was senior editor at Automobile Quarterly, I rescued a wonderful big 3×2-foot photo of the great Grand Prix champion René Dreyfus (the world’s last great Frenchman), and his Type 35 Bugatti, from the dustbin and brought it over to Le Chanteclair, his wonderful French restaurant on 49th Street, Manhattan, for him to inscribe to me. Then I framed and hung it. Over the years the signature faded to nothingness, and recently I “restored” it by retracing the inscription with a fine-point felt tip. However, that was Dreyfus, not Churchill, anybody can tell I’ve doctored it, and I don’t recommend this for Churchill autographs….