>>16745630
>>16745635
https://space.stackexchange.com/questions/3200/what-is-the-cause-of-discoloration-along-the-edges-of-the-quest-joint-airlock-th
> Notice what looks like scorch marks on the hatch thermal cover, the effect of vacuum and atomic oxygen on the threads and thread sealant used on the thermal cover. The 'smell' of space follows suit, I’ve heard it described like burnt cake or cookies, or like the smell of an extinguished match."