Most commonly,their face, neck and sometimes their whole body turns red.

VOA: special.2009.05.13

So that's promising. We did, in fact, see red in our spectrum, and it turns out that that's exactly the wavelength that we see is that we're at 657 nanometers.

这是可能的，事实上，我们在光谱里看到过红色,结果它就是我们看到的在657纳米处的波长。

麻省理工公开课 - 化学原理课程节选

Most commonly,their face,neck and sometimes their whole body turns red.

VOA: special.2009.06.23