Teal colored 32x32 baseplate?

[mbowman55]

Just wondering if anyone had seen a 32x32 baseplate this color before? and might know what set or sets its from. Couldn't seem to find any info on bricklink. Thank you. (Below is the baseplate in question and a more typical blue baseplate for comparison)

[Shortbus311]

I was going to say the same thing... just looks like a old discolored blue baseplate. But if you want to be sure just soak it in hydrogen peroxide in the sunlight, that should take away some of the discoloration

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[Foreman Porgy]

Depending on the age of the baseplate, I believe that the baseplate on the right could just be faded.