1.Select those apples which are fully maturedfruits with dense flesh, has high sugar content, thin skin and thick flesh. Remove those rotten and disabled fruits. In order to remove the pesticide on the peel, soak the fruit in a 0.5%-1% dilute hydrochloric acid solution for 3-5 minutes and then wash it with running water. Remove the peel and core by hand or machine, cut the apple into 7-8 mm thick round slices, and then put them in salt water.

2.Put the cut apple slices in 3-5% salt water or 0.5% sodium sulfite solution to protect the color to avoid oxidation and browning. Pick up the fruit slices and put them on the plate, and send them to the sulfur fumigation room for 15-30 minutes. Burn 2-4 kg of sulfur for per 1000 kg of fruit pieces.