What are the maturity indices of tomato?

Tomatoes mature from entirely green in the first stage of maturity to red on more than 90% of the surface in the sixth and final stage of maturity. Tomatoes are harvested in the second stage when the colour changes from green to tannish-yellow and covers less than 10% of the tomato surface. Tomatoes for drying should be gathered when over 90% of the surface is red in the sixth and final stage. During the ripening phase, the weight, size, and Brix increase, while the hardness declines.