Dupes in atmo suits spawn refined carbon around isolated gold volcano in pure oxygen atmo

Happened to me too

do they have (had) suits (cloth) on them ?

When this happened to me, the dupes lost their snazzy suit.  This is probably the source of the refined carbon.

can confirm dupes lost snazzy suits while going around in atmo suits in high temp area

I didn't notice clothing, as my dupe had an atmo suit on(can he have a snazzy suit in the same time?), but the refined carbon is 2kg for reference in my case. Maybe another one without a suit went to the volcano and the suit melted.