Thougue the series was live, not sure why the 100.000 is embedded.

Though this is not the purpose of the post... and I am not doubting what has been said here regarding how to save a lunette from turning black, because, as I have mentioned in Jerry Birl's thread asking if it can be stopped, we know of some series dating to the 1930's, which are in their original state of preservation without color change... which might suggest storage plays an important part.

The lunette can be seen in this ChipGuide image, and what it looks like now (today).

...and now.