What are the effective factors in the quality of the color of tomato paste?Why does the color of a factory product change in various dates?
In Iran The color of tomato paste depends largely on the type of the tomato used. Some of the varieties of tomato such as the tomatoes produced in Mashhad and Shiraz which are brought to the market in August and September have a better red color and the obtained paste is of higher quality. On the contrary , some varieties such as the ones produced in northern part of the country or in Jiroft area which are used by factories in May , June and July to produce paste , are more faint colored , almost orange and the quality of the paste is lower. In addition to tomato variety , some factors may affect the color of the obtained paste especially its becoming darker. Factors such as concentrating in low vacuum conditions , longevity of pasteurization time , heating the paste several times , improper cooling of cans after pasteurization and burning the tomato paste during concentration.
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