"No matches found in flora and fauna databank"

The subject of this article is not named in-game.
The current title is from a guide or the game's internal data.

"Beta Acid" (as named in the Metroid Fusion data) is a highly corrosive blue-green liquid found in Mother Brain's chamber after Tourian is destroyed in Metroid: Zero Mission, replacing the lava that was there before. It will damage Samus even with the Gravity Suit. This substance is not present in Super Metroid, which could suggest that it dried up or was drained from the room.

Super Metroid did, however, have a red liquid possessing similar corrosive properties to Beta Acid; it ignored the damage reduction of the Gravity Suit, ultimately proving hazardous to any contact with Samus's Power Suit.

Ripper-X SRX Screen1

Metroid Fusion.

The same substance is also present aboard the Biologic Space Laboratories research station, in several corridors in the Tourian-like area of Sector 1, one of said areas being the room before Neo-Ridley's chamber. Like in Zero Mission, the substance's corrosive effects are harmful even to the Gravity Suit.

Metroid Zero Mission - Tourian after destruction

Metroid: Zero Mission