"They know what's happening if I suddenly go red and have to dart off," she said.
Congo red (a kind of colorant)
He would bang the desk, his neck would bulge still further and go red. "you can say what you like," he would cry, "but I've thought about this - and I know what I think!"
Kong Yiji would go red in the face.
congo red damage test
You go red with anger and white with fear.
