I've also decided to rework the rainbow factory again. This time, the rainbows are actually like the rainbows in canon: they're normally liquids, instead of being metal bars.
What it does now:
-Body parts go into Extractors, as before;
-Extractors produce spectral orbs, as before, but the orbs are now color-coded; there's a probability to produce an orb of each type;
-Spectral orbs are liquefied at the Spectral Mixer (ex-Smelter), and liquid spectra is stored in jugs. There's a chance of producing a 'dead' rogue stone that can be 'energized' with rainbow sludge (the grinder works as before);
-Liquid spectra is mixed into rainbows, which are also liquid;
-Rainbows can be solidified using a synneplast chunk, in order to make furniture and other stuff at the Spectral Kiln (no fuel needed);
-Reactions that require rainbow (like producing enchanted bonemold, etc) will use liquid rainbow;
-Stockpiling: spectral orb material is under 'stone'; liquid spectra and rainbows are under 'misc liquid' (food); solidified rainbows are also 'stone'. Also, I've made Ether Orb material 'stone';
-Extractor and Grinder reactions use the Pressing labor, Mixer and Altar reactions use Alchemy; Kiln reactions use Alchemy (for treating synneplast with liquid rainbow) or Pottery (for forming things out of solid rainbow chunks).
I've also added Dark Iron nuggets as a mineral, found in small clusters inside iron (hematite, etc) veins. Saronite steel is now smelted from dark iron.