I'm playing with Petroleum Handling. Have recently unlocked Drilling Fluid 2 and would like to make some. But this requires guar gum. The recipe for guar gum is listed in the crafting pane as requiring 150 units of guar bean seeds and 1 unit of plastic bar. Fine. But it also says "Made in:" and then ...

Pitch is produced by the "Tar refining bottoms" recipe, which is unlocked by the "Tar processing" research.