1. Lebensmittel-, Bedarfsgegenstände- und Futtermittelgesetzbuch; (Lebensmittel- und Futtermittelgesetzbuch – LFGB) dated September 1, 2015; newly formulated June 3, 2013|1426; last amended by Article 1, June 30, 2017| 2147
2. Commission Regulation (EU) No 10/2011 of 14 January 2011 on plastic materials and articles intended to come into contact with food; with the following additions: EU 10/2011; 2011/1282 EU; 2012/1183/EU; 201/202/EU; 2015/174 EU
3. https://colour-index.com
4. Farbmittel für Lebensmittelbedarsgegenstände und Lebensmittelverpackungen aus Kunststoff, Aspekte der Produktsicherheit, ETAD, VdMi, 2002
5. Technical document of Clariant GmbH, Division Pigments & Additives, 65926 Frankfurt (Main), January 1998