Concentrated Spirits of Salt ★★★

Taken all the way down to base materials, one Concentrated Spirits of Salt is 2 crafting steps deep and needs 1 intermediate — Spirits of Salt ×1 — which resolves to 3 distinct raw materials totalling 5 units, plus 44 crystals.

That bill outweighs 4,201 of the 13,602 recipes tracked here and 826 of the 1,591 Alchemist ones, and 4,464 recipes nest deeper.

Only 23 of those crystals go into the final step; the other 21 are burned by the intermediates, so the real crystal cost is 23 Water Shard and 21 Lightning Shard.

Every step is Alchemist work, from a Lv 50 intermediate up to the Lv 50 finish, so one class covers the whole chain.

1 of the 3 raw materials come out of the ground, and one of them is time-gated: Volcanic Rock Salt (17:00). That window comes round once per Eorzean day, every 70 real-world minutes.

Nothing in the data consumes Concentrated Spirits of Salt: it is one of 169 end products among the 183 Alchemist recipes at Lv 50.