Quick answer
Current Subnautica2.gg and Subnautica2Hub blueprint data list Mild Acid as unlocked by default and crafted at the Fabricator with Acidic Raion Pouch x2 and Copper x1. Dexerto also lists a Processor route that uses Acidic Raion Pouch x2. Current use lists connect Mild Acid to Biolab, Processor, and Echo Location, and the Processor then opens the Strong Acid route, so keep extra pouches if chemistry is next.
Field notes for Mild Acid batches
The pouch route is the real cost
Copper is easy to blame because you see it everywhere. The slow part is usually going back for two pouches after you already decided to craft acid.
Make acid in useful pairs
One Mild Acid solves one button press. Two or three pieces make Processor, Biolab, and Echo Location planning feel less like a chain of interruptions.
Do not move all pouch stock away from batteries
Mild Acid is important, but Basic Battery still feeds tools and Power Cell. Keep a small pouch split before chemistry takes the whole pile.
Mild Acid crafting plan
Start from the Acidic Raion Pouch loop
Mild Acid depends on pouches first. If you are still missing the source, go back to the Acidic Raion Pouch route and mark your Coral Gardens path before you farm Copper.
Use Fabricator as the safe recipe
The two blueprint databases agree on the Fabricator recipe: Acidic Raion Pouch x2 and Copper x1 for Mild Acid x1. That is the recipe to plan around first.
Check Processor once it exists
Dexerto lists a Processor route using Acidic Raion Pouch x2. Treat it as a useful alternate route, but confirm it in your save before moving all pouch stock away from the Fabricator.
Make acid in pairs
Pouches are the slow part. A single Mild Acid may unblock one craft, but two or three planned acids stop you from making the same harvest trip every ten minutes.
Store it near upgrade crafting
Biolab, Processor, and Echo Location sit around different build and upgrade loops. Once the Processor exists, it also points you toward Strong Acid and later oxygen or vehicle prep. A labeled chemical locker saves a lot of "where did I put that acid" time.
Acid chain
Harvest
Pouches
Acidic Raion Pouch is the slow input.
Craft
Mild Acid
Fabricator first, Processor if available.
Spend
Upgrades
Biolab, Processor, Echo Location, then Strong Acid.
Mild Acid checklist
| Need | What to confirm |
|---|---|
| Fabricator recipe | Acidic Raion Pouch x2 and Copper x1 in current blueprint data. |
| Processor route | Dexerto lists Acidic Raion Pouch x2 at a Processor. |
| Unlock state | Subnautica2.gg and S2Hub list default unlock. |
| Used in | Current public data connects Mild Acid to Biolab, Processor, and Echo Location. |
| Next chain | Processor opens Strong Acid, which can affect Power Cell and Rebreather planning. |
| Patch check | Recipe routes and station requirements can change during Early Access. |
Do not spend every pouch on batteries
Basic Battery only needs one Acidic Raion Pouch, but Mild Acid asks for two. Once you are past the first Scanner and tool crafts, start reserving pouch stock for chemistry.
FAQ
How do you craft Mild Acid in Subnautica 2?
Current Subnautica2.gg and Subnautica2Hub blueprint data list the Fabricator recipe as Acidic Raion Pouch x2 plus Copper x1.
Can you make Mild Acid at a Processor?
Dexerto currently lists a Processor route using Acidic Raion Pouch x2. Confirm it in-game before depending on that route, because public Early Access data can differ.
What is Mild Acid used for?
Current public data connects Mild Acid to Biolab, Processor, and Echo Location recipes. Processor then becomes the bridge into Strong Acid, so the pouch route keeps mattering after the first base stations.
Do you need to scan Mild Acid?
Subnautica2.gg and Subnautica2Hub currently list Mild Acid as unlocked by default. If it does not appear in your save, pick up an Acidic Raion Pouch and check the Fabricator again.