A QR code made by Donghe Agricultural Group using white and black rice has set a new Guinness World Record in Harbin, Northeast China's Heilongjiang Province, Oct. 10, 2018. The image, 30 meters on each side, used five tons of black rice and five tons of white rice, making it the world's largest QR code made from grains. (Photo: China News Service/Yu Kun)

A QR code made by Donghe Agricultural Group using white and black rice has set a new Guinness World Record in Harbin, Northeast China's Heilongjiang Province, Oct. 10, 2018. The image, 30 meters on each side, used five tons of black rice and five tons of white rice, making it the world's largest QR code made from grains. (Photo: China News Service/Yu Kun)

A QR code made by Donghe Agricultural Group using white and black rice has set a new Guinness World Record in Harbin, Northeast China's Heilongjiang Province, Oct. 10, 2018. The image, 30 meters on each side, used five tons of black rice and five tons of white rice, making it the world's largest QR code made from grains. (Photo: China News Service/Yu Kun)

A QR code made by Donghe Agricultural Group using white and black rice has set a new Guinness World Record in Harbin, Northeast China's Heilongjiang Province, Oct. 10, 2018. The image, 30 meters on each side, used five tons of black rice and five tons of white rice, making it the world's largest QR code made from grains. (Photo: China News Service/Yu Kun)