In Portal 2, what is the name of the gel that allows portals on any surface?

In Portal 2, the gel that allows portals to be placed on otherwise unsuitable surfaces is called Conversion Gel.

Conversion Gel coats surfaces and makes them portal-conductive, allowing the Aperture Science Handheld Portal Device to create portals there. This expands the puzzle space beyond the white panels that normally support portals and lets players alter the environment itself.

The gel is often confused with Propulsion Gel and Repulsion Gel. Those orange and blue gels change how objects and characters move, while Conversion Gel changes whether a surface can accept a portal. The three gels therefore solve different kinds of problems and are frequently combined in later test chambers.

Conversion Gel is especially important in Portal 2's underground Aperture laboratories, where players encounter large areas of concrete and other surfaces that normally cannot receive portals. Its story connection to moon rocks also ties the gel to Aperture's reckless experimentation.