A fresh fruit is always firm or soft on touch. Its skin shows natural look which changes day by day. A fruit dipped in formalin solution feels hard on touch. Colour of the fruits skin becomes dull and will not change over time. Usually the smell of the fruits attracts many insects. So, fresh fruits are surrounded by many fruit loving insects. But fruits with formalin are free from insects like flies, bees, ants or any other fruit loving insects. So, before you buy fruits watch for these scenarios.