| abstract |
An object of the present invention is to provide a safe ultraviolet absorber which can be manufactured at a low cost, has a high ultraviolet absorbing ability, and is safe. One or more selected from addition treatment, oxidation treatment, reduction treatment, alkali treatment, acid treatment, electromagnetic wave treatment, enzyme treatment, microbial treatment, subcritical fluid treatment, and supercritical fluid treatment of chemical substances or metal ions. UV absorber containing treated lignin. [Selection diagram] None |