CHAT: sacre bleu!

Can someone enlighten me to the origin of this phrase?
What's sacred or holy about the color blue?

Zut alors!  I have missed one!

o/~
    Sacre bleu, what is this?
    How on earth could I miss
    Such a sweet little succulent crab
    Quelle dommage, what a loss!
    Here we go, in the sauce
    Now some flour, I think, just a dab!
o/~

(Snippet of "Les Poissons" from Disney's "The Little Mermaid".  Sung by René
Auberjonois with an outrageous French accent of which John Cleese could
be proud.)

-Mark

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