Factorio Forums

A component is missing on few recepies. Especially with the blue potion. It is sodium hydroxyde. As you can see that component is no ware. And also you can see I can go furthur with the research. I had check with all furnce type and assembler and also electrolyser and or machinery. I found no sodium hydroxyde. I using Bob's mods.

You are doing the bob's mods equivelent of searching for Petroleum gas! (or heavy/light oil)
It's one of those items that's from a recipe that gives multiple results, therefore you can't see it on the recipe directly.

Electrolysis 2, Recipe: Salt water Electrolysis. You get Hydrogen, Chlorine and Sodium Hydroxide.

Though this is when using only bob's mods, some other mods, such as Angels, may change the way you get Sodium Hydroxide.