Suggestion for the criterion change of the metameric colour evaluation

One number, metamery index, does not give enough
information about metameric properties of the
colours, as well as the colour difference is not
enough to describe their varieties. Because of
that, the procedure is suggested that describes
metamery with the following three parameters in
more details:
a) color temperature (or interval of colour
temperature) of the light source (Planck radiator)
for which the chromacity difference of the
metameric colours is minimal (the balancing colour
temperature Tm or delta Tm)
b) colour difference at Tm (delta Tm)
c) chromacity chnage in determined chosen
interval of the colour temperature which contains
Tm (delta c 1000, delta c 500 or otherwise).