The abstract of an article by B. P. Chandra, V. Kalia and S. C. Datt of Rani Durgavati University (Jabulpur, India), entitled Crystalloluminescence: a new tool to determine the critical size of a crystal nucleus, states:
"There is a time lag between the achievement of supersaturation in a solution and the appearance of crystalloluminescence flashes from crystal nuclei. The incubation time of crystalloluminescence decreases systematically with the concentration of the solution. A new method based on crystalloluminescence measurements is proposed for the determination of the critical size of the crystal nucleus."