Who proposed the technique for assessing seed vigor by evaluating the color intensity of stained seeds?

Explanation

The method of estimating seed vigor based on the color intensity of stained seeds was introduced by Kittock and Law in 1969. Other researchers, such as Woodstock (1976), Maguire (1962), and Nicolls & Heu Decker (1968), contributed to seed testing but did not describe this particular technique.