Another noteworthy method is the use of eco-friendly solvents such as deep eutectic solvents (DES). Dai et al. (2020) investigated the use of DES for extracting flavonoids from lotus leaves, finding that this method enhanced extraction efficiency and yield . DES are biodegradable and less toxic compared to conventional solvents, offering a greener alternative for natural dye extraction. Nevertheless, the relatively new nature of DES means that more research is needed to fully understand their long-term environmental impact and optimize their use. ) highlighted the effectiveness of PLE in extracting phenolic compounds from olive leaves. The method involves using high-pressure liquids at elevated temperatures to enhance extraction efficiency . PLE offers the advantage of reduced solvent usage and faster extraction times, but the requirement for specialized equipment and the potential for thermal degradation of sensitive compounds are drawbacks.