Bernard -- there is a very good article somewhere on the internet about the use of Ultra-violet lights (black lights) to detect repaints/retouches. I found it on the internet, and I remember it included photos of "touched-up" figures. I remember, however, that the article cautioned that sometimes the "touch-ups" were done at the factory before shipping. So it's not 100% fool-proof. I have looked for the article, and done a google search to try and find it again -- so far no luck. But as soon as I can locate I will send it to you. As noted, the light will show different sheens if the figure has been touched-up. But if the entire figure has been repainted -- then you have to compare it with other figures in the same set to see if it is a "mis-match." An ultra-violet light ( maybe 10-15 dollars) for a cheap one is a good start, however.
