Need more difference between different chemicals

[MuyeEcho]

Need more difference between different chemicals, as copper is different from iron, the difference can be show in the blue print .For example 25 copper for wire but 15 iron for wire.

And need more way to deal with chemicals, we can use Cl2 and NH3(from toilet)to make fertilizer etc.

[jirkazr]

If it's supposed to be realistic, then you'd actually need a lot more iron for wire, since you need thicker wire to sustain the same load. Copper is a much better conductor that iron. Better than most metals, actually.