Check the paper, especially figure 5: https://doi.org/10.1002/adsu.202400184 https://doi.org/10.1002/adsu.202400184 Burning the end-grain wood makes a particul

Check the paper, especially figure 5: https://doi.org/10.1002/adsu.202400184 https://doi.org/10.1002/adsu.202400184 Burning the end-grain wood makes a particularly complex porous structure that minimizes the chance of reflected light escaping ("velvety").