What is this picture?

Question

What is shown in this image?

Accepted Answer

red cabbage cross-section. When you slice a red cabbage in half, the natural pigment anthocyanin creates those beautiful concentric rings, and this same compound actually changes color depending on pH—it turns pink in acidic conditions and blue in alkaline ones, which is why red cabbage is used as a homemade pH indicator in science experiments. So that gorgeous spiral pattern you're looking at is basically nature's built-in chemistry kit.

Answer: red cabbage cross-section