Do not try to ripen tomatoes on your window cell and do not refrigerate unripened tomatoes. If you put them on your window sill, (as our grandmothers did) it will be too warm for the tomato and will promote spoilage instead of ripening. The sun's heat can be intensified by the glass and it can burn the tomato. Instead put it in a paper bag and add an apple to the bag. The apple gives off a gas that promotes the ripening of the tomato and the reduced light will prevent it from burning.
If you put the tomatoes in the refrigerator or a temperature below 40 degrees, it will stop the ripening process and it will no longer ripen further no matter what method you try.
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