The image shows a black surface with a ruler and a piece of paper on top of it, along with a few corals and some papers with text on them.
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The image shows a black surface with a ruler and a piece of paper on top of it, along with a few corals and some papers with text on them. The corals appear to be bleaching, with some of them having a yellowish hue and others having a darker hue. The papers have text written on them, likely providing information about the bleaching process.