１９９２年，北京食品研究所转让“黑色食品专利配方”，广西，山东一南一北两家企业上门，同时花１万元买走了专利。５年过去了，广西的南方黑五类集团已经和它的广告“逢黑必补”一样家喻户晓，１９９６年年销售收入达３亿元。而济南市宏丰食品厂却仍然是一个年销售收入不过 In 1992, the Beijing Food Research Institute transferred “Black Food Patented Formulas” to two companies in Guangxi and Shandong Province, one south and one north, and bought a patent for 10,000 yuan at the same time. Five years have passed, and the Southern Group of the Black Five in Guangxi Province has become as household-name as its advertisement “Every Black Will Make Up”. In 1996, its annual sales revenue reached 300 million yuan. Jinan Hongfeng Food Factory is still an annual sales revenue, however