Deep White ABP Liquid is a high performance optical brightener which is free from tetra-sulphonic and is formed by using best grade raw substances in proportioned values. It is a stilbene based urea which is mainly used for enhancing the quality and to increase the brightness of pulp and paper. It enhances the optical properties such as ISO brightness, Lab colour space values of paper and the CIE whiteness. Deep White ABP Liquid can be used in various different stages of paper production processes such as coating section, wet end and size press.