[moltuae]

Originally Posted by David's8

I think the "magic" explanation is better Mark

I think the explanation lies with it being described as a "Chelator". Chelation is a type of bonding of ions and molecules to metal ions. It involves the formation or presence of two or more separate coordinate bonds between a polydentate (multiple bonded) ligand and a single central atom. These ligands are called chelants, chelators, chelating agents, or sequestering agents. They are usually organic compounds.
Chelation is useful in applications such as providing nutritional supplements, in chelation therapy to remove toxic metals from the body, as contrast agents in MRI scanning, in manufacturing using homogeneous catalysts, in chemical water treatment to assist in the removal of metals, and in fertilizers. (Wikipedia explanation ....... not mine!!)

I should've paid more attention in Chemistry lessons (instead of making my own experiments and setting fire to stuff with the Bunsen burners).

I wasn't aware of this 'Chelation' you speak of. Interesting stuff; I need to do some reading. In the meantime, I think you're right, "magic" will do. Or maybe 'witchcraft'. To paraphrase Python, 'if it looks like witchcraft, it must be witchcraft!'