'Catclo' contains titanium nanoparticles that attach to the surface of fabrics and work to rid the air of nitrogen oxides.

‘Catclo‘ is a liquid laundry additive containing titanium nanoparticles that stick to the surface of fabrics and work to rid the air of nitrogen oxides, particles that have been linked to respiratory problems and other conditions. It has been developed by Tony Ryan, a professor of physical chemistry at Sheffield University, and the fashion designer Helen Storey.

One person wearing clothes treated with the additive would be able to remove around 5g of nitrogen oxides from the air in a day, which is around the same amount produced each day by the average family car. The additive is harmless and unnoticeable from the wearer’s perspective. Professor Ryan said:

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