There m-e two kinds of representation methods of the Helmholtz-Kohlrausch effect; one is the Variable-Achromatic-Color method and the other the Variable-Chromatic-Color method. The following three items are described in detail. (1) How to use and adapt the prediction equations of the two methods to their practical applications. (2) Theoretical derivations of the prediction equations in bath methods, cmd clarification of the simple relation existing between rite numerical coefficients used in the prediction equations on the two methods. (3) Logical consistency between rite long series of studies on the H-K effect by the author and his colleagues.