though-this-world-may-be-broken

code/game/objects/effects/effect_system/effect_system.dm

@@ -8,7 +8,6 @@ would spawn and follow the beaker, even if it is carried or thrown.
 /obj/effect/particle_effect
 	name = "particle effect"
 	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
-	unacidable = TRUE //So effects are not targeted by alien acid.
 	pass_flags = PASSTABLE | PASSGRILLE
 	anchored = TRUE
 

code/game/objects/effects/effect_system/effects_foam.dm

@@ -170,6 +170,7 @@
 	desc = "A lightweight foamed metal wall."
 	icon = 'icons/effects/effects.dmi'
 	icon_state = "metalfoam"
+	resistance_flags = FIRE_PROOF | ACID_PROOF
 	density = TRUE
 	opacity = TRUE	// changed in New()
 	anchored = TRUE