Law 1: An Alchemist must have a medium for any form of alchemy to succeed.
Law 2: In order for true alchemy to operate, an Alchemist must fully understand the structure of matter. He/she must possess the “sight” (the ability to not see an object as a whole, but as a structure constructed of trillions upon trillions of atoms).
Law 3: The Laws of Nature are absolute in the art of alchemy. An Alchemist cannot create a reaction from nothing. He/she must be able to present something that is equal in value to that which he wishes to receive. Likewise, in order to turn an object into something else, an Alchemist must first break the object down to its simplest state and then reconstruct it completely using Celsis.
Law 4: To prevent the creation of life, (something that is considered a taboo for trying to tread in the realm of the high Celestials) one cannot manipulate carbon cells that are connected to a living thing. Namely, one cannot take carbon cells from a living thing and transfer it to another living or non-living thing; even for the purpose of replacing missing tissue. Alchemy can only be used to replace lost or damaged carbon cells with only dead tissue. An Alchemist must be able to “resurrect” the dead tissue so that it can become living tissue after the necessary process is complete.
Law 5: Alchemy is a process fueled by an Alchemist and the energy of his environment. A symbol, better known as a seigo, is required to start a reaction and also to draw the Celsis necessary for it to succeed. Some Alchemists can use their Celsis in combination with Ios to create Seia, similar to how Kamora is used with Dragoons. This allows them to cause an effect without any need to draw both a seigo for the reaction they wish to initiate and another for the Ios they require for it to work.
Law 6: Alchemy is an irreversible process. Once a reaction has been commenced it cannot be stopped until the process is complete