The "flash" of peony parrots refers to a special genetic mutation that causes the parrot's feathers to appear shiny when exposed to sunlight or light. Specifically, this mutation affects the distribution and reflection of pigments in the feathers, allowing the surface of the feathers to reflect more light, creating the visual effect of glitter.

In peony parrots, the characteristic of flash is that the whole head is white with green, silver or gold tinges. Equally colored top and back, clear boundaries between colors, and overall color coordination. In addition, the color on the tips of "Shin's" tail feathers is also the same as the color of its head, further enhancing its visual effect.