I live in Delhi where most retail mangoes are ripened using carbide. Therefore, certain stores sell unripe mangoes which are supposed to be ripened before eating. One method that is popular is wrapping individual mangoes in newspapers.
However, most of them develop black spots before ripening which leads to degradation of pulp in many areas in the mango and basically does not allow one to keep it till it ripens completely. There's also some wrinkling happening. What is the reason for this and how does one fix this issue? Hay is not available here so ripening them in boxes is impossible.