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No, it's true,

If you put, for instance, the horsefly 8 hours in a closed box with very wet papers, you can revive the eye colouration.
However, you never get the original 100 % back.
In most cases, it is enough for identification.
And with fresh material, in most cases you can reconstruct the eye pattern even in dry material by looking at the eye with a strong light.
You will see traces of the eyebands, in most cases at least.
However, experience is needed.


Theo