In the first episode of Star Trek: Picard the character Dahj is attacked for a second time. During the fight it is revealed that the attackers are Romulan. Dahj fights off all the attackers, but one of them, obviously wounded, spits a green substance on Dahj and a gun she is holding. The green substance appears to be blood. It burns into Dahj's skin and also causes a (plasma?) gun she is holding to explode, killing her.
The only other green substance I know of that corrodes materials like that is the blood of the Xenomorphs from the Alien universe. Is there a connection? Coincidence? In this day and age?
I know Romulans are related to the Vulcan people. What color is their blood.
And if it was not blood but some type of bio-weapon, how could the Romulan attacker spit it without himself getting wounded?