A raisin is a dried grape. Raisins are produced in many regions of the world and may be eaten raw or used in cooking, baking, and brewing. Raisin varieties depend on the type of grape used, and are made in a variety of sizes and colors including green, black, brown, blue, purple, and yellow. Seedless varieties include the sultana , the Greek currants and Flame grapes. Raisins are traditionally sun-dried, but may also be water-dipped and artificially dehydrated.
“Golden raisins” are treated with sulfur dioxide after drying to give them their golden color.
The product in process is from seedless grapes of the variety. Sun-dried raisins are seedless grapes dried in direct sunlight and as a result they are typically dark-brown in color. This kind is treated without any additive and is high in sugar level. Sun drying is seen as a natural way to produce raisins that not only gives them a particular intense flavor but also maintains the delicate balance of nutrients of the original grape fruit. Like other types, sun dried raisins are dried, coated with vegetable oil, stemmed, mechanically cleaned, laser and hand sorted then metal detected under extreme care of hygienic conditions and with legal and safety requirements and the customers special specifications.
After the drying process is complete, raisins are sent to processing plants where they are cleaned with water to remove any foreign objects that may have become embedded during the drying process. Stems and off-grade raisins are also removed. The washing process may cause rehydration, so another drying step is completed after washing to ensure that the added moisture has been removed.
All steps in the production of raisins are very important in determining the quality of raisins. Sometimes, sulfur dioxide is applied to raisins after the pre treatment step and before drying to decrease the rate of browning caused by the reaction between polyphenol oxidase and phenolic compounds. Sulfur dioxide also helps to preserve flavour and prevent the loss of certain vitamins during the drying process