BACKGROUND: Photocatalysis of titanium dioxide (TiO(2)) substrates is primarily induced by ultraviolet light irradiation. Anion-doped TiO(2) substrates were shown to exhibit photocatalytic activities under visible-light illumination. relative environmentally-friendly materials. Their anti-spore activity against Bacillus anthracis. https://parisnaturalfoodes.shop/product-category/colour-bath-turquoise/