"
The company is quick to point out that the green hue is achieved by stripping the color from traditional Heinz Ketchup and adding green food coloring, not from green tomatoes as many consumers suspect. Intensive testing was conducted to ensure that the same great taste of Heinz Ketchup is present in the new green version.
Outside of the packaging, the only difference in the new EZ Squirt variety is the fact that the green version is not called 'tomato ketchup' because the addition of the food color means the product is no longer 100% ketchup. Plus, both the red and green versions are fortified with Vitamin C, most likely to appeal to kid's parents."
If they had used green tomatoes in cooking they would have gone brown like they do in chutney.
Green tomato chutney is wonderful I must see if I can find mum recipe. She used to grow tomatoes and often the last crop would not ripen so she made this chutney would used to last us through till to end of Christmas and new year holidays.