It doesn’t look quite that simple. The paper describes the procedure as follows: > In a typical fabrication, LiCl powder (0.32–0.82 g) is added into 10 mL HPC

It doesn’t look quite that simple. The paper describes the procedure as follows: > In a typical fabrication, LiCl powder (0.32–0.82 g) is added into 10 mL HPC solution (0–2.0 wt%) forming solution A. The pH of solution A can be tuned by NaOH or HCl solution. 0.44 g KGM powder is added into solution A and quickly cast into the petri dish after vortex. The gelation takes place within 2 min, and sit in room temperature for 15 min. Then, the film is placed in the fridge (−4 °C) for 3 h followed by 15 min freeze in liquid nitrogen. Last, the gel film is ready to use after 12 h freeze-drying. [https://doi.org/10.1038/s41467-022-30505-2 https://doi.org/10.1038/s41467-022-30505-2]