Acids
Sulfuric Acid

Sulfuric Acid is the basis of polymer chemistry, circuit etching, and organic material dissolution. It is also used by the fourth stage of the ore processing chain. This acid may be produced by Mixing the crushed pulp of Vitriol Berries and Water. Alternatively, Sulphurine may undergo a controlled but slow reaction with Water in the Chem Lab to yield Sulfuric Acid.
Hydrochloric Acid

Hydrochloric Acid is a purifying acid used by the fifth stage of the ore processing chain. As the name might suggest, it is made by mixing an equal ratio of Hydrogen and Chlorine in the Chem Lab. It is also produced as a waste product from Fluoropolymer and Silicone Oil manufacturing, though this should only be considered a supplementary source.
Hydrofluoric Acid

Hydrofluoric Acid is highly toxic, but it is one of the three key ingredients for producing Fluoropolymer. It can be made by dissolving Fluorite gems in Sulfuric Acid in the Chem Lab.