This intermediate compound is then refined further and reacted with oxygen at high temperatures to yield titanium dioxide This intermediate compound is then refined further and reacted with oxygen at high temperatures to yield titanium dioxidetitanium dioxide is prepared from factory. The chloride process generally results in a higher purity product and is more energy-efficient, but it requires sophisticated equipment and handling due to the corrosive nature of chlorine gas.The brands of lithopone of the normal class, that of chemical manufacture, are marketed under such names as Ponolith, Beckton White, Jersey Lily White, Oleum White, Zinc Sulphide White, all of these being of domestic manufacture, and their composition is of the 30 per cent. zinc sulphide type. The German manufacturers and exporters of lithopone make use of fancy names for their brands and here are a few examples of these and the composition of the pigment:-
Prof Matthew Wright, both a member of the FAF Panel and chair of EFSA’s working group on E 171, said: “Although the evidence for general toxic effects was not conclusive, on the basis of the new data and strengthened methods we could not rule out a concern for genotoxicity and consequently we could not establish a safe level for daily intake of the food additive.”