2279 back from the brink...full circle

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Great story and beatiful watch!
Can somebody please explain to me, why below "Tachymètre" and "Telemètre" The dial has another shade of white?
 
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A friend once had a similar experience. He serviced a chronograph with a similar dial with a royal blue background. He gave the dial a “swish” in soapy water, rinsed it, put it to dry under a UV light to dry, then forgot about it! The customer wouldn’t accept a sky blue dial.