Pink Slime

So first, the Pink Slime liquid comes from the Mob Slaughter Factory. To get the Pink Slimeball you have to fill a bucket (or other fluid container) with Pink Slime, then place it somewhere in the world. Eventually that Pink Slime Liquid will turn into a Pink Slime Mob, and will start jumping towards you. The Pink Slimeball drops after killing the Pink Slime.

To get the Pink Slime Ingot, you actually have to use the Fluid Sieving Machine. Insert some Pink Slime liquid and an Iron Ingot to get a Pink Slime Ingot.