Bury the fruit in rice
As unripe fruit begins to ripen, the flesh emits ethylene gas, a hydrocarbon responsible for its aging and quickening ripening process. Ethylene, or C2H4, is a colorless and odorless compound.
When left in a well-ventilated area, the ethylene gas dissipates, causing the fruit to ripen slowly. Burying the fruit in a container of rice helps trap the gas and maintain a warmer temperature, expediting the ripening process.
Ripen with incense
A common folk technique is to ripen bananas near incense. The incense stimulates the unripe fruit to produce more ethylene, hastening ripening. 
A book titled “800 Life Hacks for Daily Living,” published by Thanh Nien Publishing House in 2000, offers a detailed guide. It suggests placing bananas in a large plastic bag with a bowl or cup of sand or ash. Break incense sticks in half and insert them into the bowl, lighting them so that their fragrance lingers. Once the incense burns out, remove the bowl and tightly seal the bag. The bananas will absorb the incense fragrance and ripen quickly. Many banana vendors in markets still use this economical, effective, and safe method. Be cautious when burning incense to avoid setting the bag on fire.
Poke a stick into the jackfruit’s stem
A simple trick passed down from mothers and grandmothers is to hasten the ripening of jackfruit by poking a stick into its stem after plucking it and leaving it in a corner. Scientifically, this action damages the plant cells, increasing respiration and ethylene production, thus speeding up the ripening process. 
Place unripe fruit next to ripe fruit
Another simple method is to mix ripe and unripe fruit together. The ripe fruit will emit ethylene, encouraging the unripe fruit to mature faster. To expedite the process, place a ripe apple or banana in a plastic bag with the unripe fruit, as these two fruits release more ethylene than other types of ripe fruit.
Additionally, traditional methods include placing fruit near a stove or in a closed oven to take advantage of the heat and retain ethylene. Using paper bags, cotton, or linen cloths with an outer covering can also help. After 2-3 days, the fruit will ripen naturally, resulting in delicious, fragrant produce.
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What is the effect of applying chalk on jackfruit?
Lime application on the tip of a jackfruit has antibacterial properties and helps prevent bacterial invasion.
Feng Shui Master warns against this type of incense burning if you don’t want to lose your fortune, but many families still do it every month
Burning incense on the ancestral altar and the altar of the Wealth God has been a tradition and habit of many Vietnamese people. However, many people still follow this type of incense without knowing that the more they burn, the more they lose luck.
