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[–] 3 points 1 month ago

What do you mean by flash?

If you mean like a firework, that's because the droplets of oil/whatever get flung out when the surface tension pops.

If you mean the color changes, as the bubble expands the amount of oil/film becomes thinner and that changes the color due to changing the density.

Like how there's a very narrow slice of eye color that has enough pigment density to be green when the pupil dilates, but when constricted there's not enough density due to increased surface area and they look blue.

(To be clear that is a very narrow slice and nowhere near the amount of people who claim their eyes fully change color)

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