Acid

Choose this when your goal specifically calls for Acid; its listed recipe gives you the direct material commitment, while the source provides no downstream-use evidence to justify stockpiling it for other plans.

When it fits: Add it only to a plan that names this output or when you have independently confirmed its in-game use; the pack does not show another output consuming it.

The tradeoff: One source recipe run makes 1 and lists 8 Salt, 8 Sulphur at Factory; 1 recipe variant(s) for this output are grouped together. Verify access where the pack is incomplete.