Preparation of red and black HgS
This protocol is extracted from research article:
Visualization of vermilion degradation using pump-probe microscopy
Sci Adv, Jun 21, 2019; DOI: 10.1126/sciadv.aaw3136

Pump-probe imaging studies. To reduce the chance for laser-induced degradation on red and black HgS, the powder was embedded in agarose gel (the gel enhances the heat diffusion), see Fig. 1. First, powder was placed on the glass slide. Agarose powder (1 g) was mixed with 10 ml of water and heated at mild temperature until the mixture turned transparent. Then, the transparent solution was applied onto the powder, and after about 30 s, the solution turned to gel. Then, the sample was covered with a coverslip.

XRD and SEM-EDS analysis. Double-sided tape was placed on a glass slide (size, 2 cm by 2 cm), then red or black HgS powder was placed on the tape.

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