[WWI] Color photos ww1

[Diego Fernetti]

> What interested me about the Nieuport pic was the shade of blue on the
roundel.

Caution! The shades of colours in the Lumiere slides are the result of the
chemical reactions of 4 layers of colored pigments, so, the colours shown in
these pictures are more or less affected by the colours of the layers of the
glass plates, and not necessarily the real shades. It only can be
ascertained that it was blue, but not exactly what kind of blue....
D.