Profile: Roha Dyechem (Thailand) Limited manufactures synthetic and natural food colors. We are an ISO 22000 certified company. Our synthetic food colors include tartrazine, sunset yellow, indigo carmine, erythrosine, carmoisine and green-s. Our natural food colors include lutein, lycopene, anthocyanin, chlorophyll, carbo vegetabillis, titanium dioxide, iron oxide yellow and riboflavin.