It was called the Residue, even though this term does not fit completely. This is because a residue is a trace left over from something that is in the same category, only greater, while the remaining trace is less. However, in the case in hand, the light that disappeared was not visible light, while the light that remained is visible light. Thus they are not in the same category, and the light that remained is not exactly a “residue” of the Infinite Light. We cannot truly say that it is a residue of that Light, only that it is called a residue. As to why it is so called if it is not really a residue, you will see later.