Another BOGOF?

Blip one get one free.  
Near enough the start of June, I caught, so far, this year's only Std distribution curve - BUT - it also demonstrates the usable light as starting ≈ 06:00(ish) - 21:00.

Now it's moved to near enough 05:00, but still ≈ 21:00 we shall see.

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Extra - A. N. Other  suggested  a soak would get the label off.  I have a feeling this one's doomed to failure - BUT - yet again "we shall see".
"Move along there, pass right down the Car."
;¬)