in my book (El color y su medición, Americalee, Buenos Aires, 1978) you can find the study of colorant power (pg.322,323,326,342,389,405-407, 410,411,431,434-437) pages where I treated the matter, and there is a formulae whch can hel to solve this questios known as the "reflectance factor".
As the text says it is a relative factor and not absolute, It depends which is agaist of.
Dear Dr. Roberto Daniel Lozano Sir,
Thank you for your answer and suggestion.
1. Narayana Swamy. V., K.N. Ninge Gowda and R. Sudhakar. Natural dye extracted from Vitex negundo as a potential alternative to synthetic dyes for dyeing of silk, (J. Institute of Engineer India Series E). 97 (1), April, 2016 : 31-38.
Follow formulae from this paper
Narendra Gangakhedkar provides the formula to compute color strength from the K/S value. Basically, it's a ratio of the K/S of the batch to the K/S of the standard.
This is somewhat problematic, since K/S is computed at each wavelength. If the theory holds true, you should compute the same K/S ratio at each wavelength. But single parameter Kubelka-Munk is only an approximation, so you need to decide on a wavelength or wavelength range to measure.
https://drnsg.wordpress.com/2013/05/19/computation-of-color-strength/
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