Now, regarding this answer:
What if "heavy" here doesn't refer to mass (as in weight) but to being "heavy" or charged with information, if information can be quantified one way or another? Information needs a medium and energy to manifest of course, but the here the focus could be different.Q: What is the 'prime matter' of the alchemical process?
Q: What? (Ark) Water can be in different states.
A: Heavy water.
I agree with that interpretation too mkrnhr. I looked up heavy water which actually has a larger than normal amount of the hydrogen isotope deuterium (2H 2O2). I somehow don't get the feeling that this what the C's were meant in reference to being the prime matter of the alchemical process.