The survey carried out in 2011 found various printing inks in foods and their packaging. Benzophenone had the highest incidence of occurrence and was detected in 37 of the 350 collected samples at concentrations ranging from 0.01-2.46mg/kg. None of the concentrations of the nine ink compounds found were at levels which are considered a public health concern. The survey was published this month in the scientific journal Food Additives  & Contaminants by Bradley et al. (2012).