Analyzing the impact of time variation while maintaining a constant dosage of 80 g/L, observations revealed that the adsorption of color reached optimal levels at 180 minutes compared to 60 and 120 minutes. Beyond 180 minutes, specifically at 240 minutes, the color removal efficiency plateaued, indicating equilibrium in pigment reduction. This finding aligns with the study by , where they investigated the effects of contact time, temperature, and adsorbent dosage under constant temperature conditions, focusing on bleaching efficiency. The absorbance value of the raw Achalla clay (ACC) was noted as 2.50, providing a baseline for evaluating the effectiveness of the Beneficiated Kaolin and ZnO-K NP adsorbents in color removal processes over time and varying dosages. The results of the bleaching efficiency are shown in Table . The increase of dosages of adsorbents increased the efficiencies of bleaching earths from 97-98%, The results showed that the bleaching performance was highly efficient, making the material a potential bleaching agent. In the kinetic experiments, the amount of color adsorbed at a time interval t, Qt (mg/g), or the percentage removal (P%) were calculated using the following equations: