Photocatalyst: Disinfects and deodorizes with light. This is a set of 5 Nacsul photocatalyst spray bottles, 20ml each. Product Name: Nacsul Photocatalyst Spray CARING BOTTLE Features: This photocatalyst spray reacts to light (visible light) to provide powerful disinfection and deodorization effects. Safety: It has passed food additive standards testing and is considered safe even if it comes into contact with places children touch or with food. Durability: It is stated that once sprayed, the disinfection and deodorization effects will last as long as it remains on the surface.