| CPC B01J 13/02 (2013.01) [A01G 15/00 (2013.01); C01D 3/04 (2013.01); C01P 2002/72 (2013.01); C01P 2002/82 (2013.01); C01P 2004/03 (2013.01); C01P 2004/84 (2013.01)] | 20 Claims |

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1. A particle comprising a core and a shell, wherein the core comprises sodium chloride and/or potassium chloride and the shell consists essentially of titanium dioxide and/or silicon dioxide, and the shell covers the core and has a thickness between about 5 nm and about 50 nm.
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