The effects of seed colouring using 25 dyes (i.e. 20 chemical and 5 natural dyes) on the quality of soyabean (cv. JS 335) and tomato (cv. Pusa Ruby) seeds were studied in the laboratory. Data were recorded for seed germination percentage, root and shoot length, whole seedling length, dry weight of seedling, vigour index, speed of germination and electrical conductivity. Rhodamine-B, Fast green and Malachite green for soyabean and Rhodamine-B and Fast green for tomato were the best dyes for seed colouring.
Tonapi, Vilas A.; Babu, P. Harinath; Varanavasiappan, S.; Reddy, Ch Ravinder; Navi, Shrishail S.; and Seetharama, N., "Studies on Seed Colouring in Soybean and Tomato" (2006). Plant Pathology and Microbiology Publications. 28.