The RAYNBOW optical sorting machine, used to remove gross defects and foreign bodies on table and processing potatoes. The idea is to provide a simple yet efficient solution to the world of high resolution sensor sorters, being equipped with bilateral vision that enables to view the product from above and below. Its pentachromatic lighting technology allows to detect necrotic spots, bruising, green spots, rotten potatoes and foreign bodies (wood, corn cobs, stalk parts, metal, glass, stones) indipendent from colour.