## 3 Results and Discussion
The results of changes in the tested parameters during bleaching using the bleaching processes described in Section 2.2 are discussed below. Bes obtained using the methodology described were averaged and converted into percentage changes for the preliminary test samples. The results are summarized for each oil sample in Table 3. The results of the calculation of the total color change are presented in Table 4.  
Low-temperature bleaching was used in the conducted research because, as shown by [PERSON] et al. [36], increasing the process temperature worsens the quality parameters of bleached oils. Based on the results obtained, it was found that the BEs used have different adsorption of natural dyes which, therefore, influences the color of the oils. Moreover, doubling the amount of added adsorbent causes disproportionate changes in the tested parameters. Therefore, when selecting bleaching earth, the type of oil and its primary and target parameters should be considered. BE3 (5.0%) was the most effective in removing chlorophylls from Finola CP oil. It reduced their amount by over 99% but also removed almost 80% of carotenoids. Chlorophylls were least effectively removed by BE6 (2.5%), which reduced these pigments by 41%. BE7 (2.5%) was the least effective in reducing carotenoids from this oil (a decrease of only 0.62%). Moreover, the bleaching earth removed 65% of chlorophylls. As indicated by [PERSON] et al. [37], to ensure the high quality of the oil, it is crucial to significantly reduce chlorophyll pigments with the lowest possible removal of carotenoids. Therefore, based on the conducted research, using chemically modified BE based on kerolite-hydrated magnesium silicate will be most advantageous. BE3 (5.0%) was the best at removing chlorophylls from Finola HP oil (over 94%), but at the same time, it showed a significant reduction in carotenoids (79%), which is not a desirable phenomenon. For the HP variant, the lowest reduction in carotenoids occurred for BE4 (2.5%), with a simultaneous reduction in the share of chlorophylls by over 58%. However, for this oil variant, it will be more advantageous to use BE5 (2.5%), which adsorbed over 72% of chlorophylls and only 7% of carotenoids. For Earlina 8 FC CP oil, two adsorbents stand out: BE2 (2.5%), for removing 67% of chlorophylls and less than 6% of carotenoids, and BE7 (2.5%): for removing >58% chlorophylls and <4% carotenoids. This oil variant is susceptible to the action of adsorbents, which was confirmed by an almost two-fold increase in the adsorption efficiency of chlorophylls and even a sixteen-fold increase in carotenoids when doubling the dose of BE. The BE5 adsorbent (2.5%) again showed the most favorable changes for the oil quality in terms of the content of natural dyes for Earlina 8 FC HP oil. The use of BE2 (5.0%), BE3 (5.0%), BE4 (5.0%), and BE7 (5.0%) in the case of this oil will be unjustified because these adsorbents are characterized by the highest adsorption efficiency of natural dyes, so the oil obtained after bleaching may lose the desired features of niche oil. The Secuieni Jubileu CP oil variant reacted the weakest with the adsorbents used. On average, only 64% of chlorophylls and 35% of carotenoids were adsorbed. Especially for BE variants (2.5%), 44% of chlorophylls and 19% of carotenoids were adsorbed. In the case of this oil, BE4 (2.5%) showed the most favorable properties. The adsorbent BE3 (5.0%) showed an above-average ability to adsorb natural dyes from this oil. On this basis, it can be concluded that using unmodified attapulgite clay for the Secuieni Jubileu variety is unjustified. For Secuieni Jubileu HP oil, the most favorable ratio of removed chlorophylls to carotenoids was obtained with BE5 (2.5%). Adsorbents BE6 (2.5%) and BE7 (2.5%) had a negligible effect on the content of natural dyes compared to the others (up to 32% reduction in chlorophylls and 20% reduction in carotenoids). It follows that the abovementioned adsorbents in these doses are not suitable for use when bleaching this oil.