Byproduct · Early refining
Players often call it Slag, but the current official Wiki names the Shaker byproduct Residue. It is not waste by default: burn it carefully, then use a Kinetic Press to return it to Gold and Seeds.
Working route
Wet Sand on a Shaker creates one Residue every time, with Gold as the separate chance output.
Flamethrower fire, Rocket Launcher napalm, a Pyro Dispenser, or Lava held in a Filter are documented ignition routes.
Each Residue has only a 25% chance to become Burnt Residue; the rest can burn away without output.
Burnt Residue needs a 25-block drop to pass through a Kinetic Press, where each successful pixel becomes one Gold and one Seed.
Questions answered
Yes. The official Wiki calls the Shaker byproduct Residue; this page targets the common Slag search term while using the official names in its mechanics.
Burn it into Burnt Residue, then drop it at least 25 blocks onto a Kinetic Press.
No. The official conversion chance is 25%, and other pixels can be destroyed by the burn.
Evidence notes
