The author of the website not only describes this exact method but he also invented the method. If you scroll to the bottom of this page you can see an example

The author of the website not only describes this exact method but he also invented the method. If you scroll to the bottom of this page you can see an example of perfect clear, if not smoothed, ice: https://www.alcademics.com/2017/05/how-to-monogram-your-ice-cubes-with-ice-brands.html https://www.alcademics.com/2017/05/how-to-monogram-your-ice-...