These studies of changes in Grimes Apples, incident to ripening and storage, include rate of softening, increase in size, color changes of fruit and seeds, other common tests used by the growr to determine time of picking, and chemical analyses of changes within the apple.
Plagge, H. H.; Maney, T. J.; and Gerhardt, Fisk
"Certain physical and chemical changes of Grimes Apples during ripening and storage pr,"
Research Bulletin (Iowa Agriculture and Home Economics Experiment Station): Vol. 7
, Article 1.
Available at: https://lib.dr.iastate.edu/researchbulletin/vol7/iss91/1