In vitro toxicological assessment of clays for their use in food packaging applications.

Maisanaba S1, Puerto M, Pichardo S, Jordá M, Moreno FJ, Aucejo S, Jos Á
Food Chem Toxicol. 2013 Jul;57:266-75. doi: 10.1016/j.fct.2013.03.043. Epub 2013 Apr 8

https://www.ncbi.nlm.nih.gov/pubmed/23579166