3 ms·

Thin gold layers are green, this looks red if you look at the beaker. There are spectral data available in the original publication https://www.nature.com/arti

• Retric 2y ago
  If I am reading that right, the beaker is filled with lots of sheets and clumps of sheets not just a single one. So, it’s not clear what if anything a single sheet would look like.
• sp332 2y ago
  I think gold reflects red light, so it lets greenish light through if you use it as a filter.