Synthetic colorants mainly carotenoids. As β- apo -8- carrot aldehyde (C30H40O) or β- A - Park -8- carotenoid ester (C32H44O) and lemon yellow pigment (C33H44O), cantharidin, Gary red, yellow Gary, exposed Kangding. Animals can not synthesize the pigment itself. The study also found that the colorant companies, only the oxygen-containing functional groups (such as hydroxyl, acyl, keto, etc.) of carotenoids (carotenoids) class in livestock, poultry, aquatic products only within the coloring effect. Liquid colorants colorant price | coloring | Weifang Fuyuan provided by Weifang Fuyuan Environmental Technology Limited. Weifang Fuyuan Environmental Protection Technology Co., Ltd. (www.wfdafuyuan.com) strong, credible, Shandong Weifang other industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Weifang Fuyuan and you hand into the brilliant, for a better future!