Why did Godzilla become red?

Why did Godzilla become red? Mothra’s ethereal essence, like shimmery stardust, falls onto Godzilla, and he absorbs her power, which causes the blue energy inside him to turn fiery red.

Mothra’s ethereal essence, like shimmery stardust, falls onto Godzilla, and he absorbs her power, which causes the blue energy inside him to turn fiery red.
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