What is the purpose of "flash coloration" sometimes seen on the hindwings of moths?

Answer

To momentarily startle a potential predator upon display

These bright colors, known as flash coloration, are suddenly displayed when the moth is disturbed, momentarily startling a potential predator, giving the moth a chance to escape.

What is the purpose of "flash coloration" sometimes seen on the hindwings of moths?
insectmothanatomycharacteristicphysical