Use a kitchen scale to measure the shellac flakes according to the pound cut you desire for the finished shellac. Place the shellac flakes in a clean glass container. Add the required amount of alcohol. Put a tight fitting lid on the container and shake well. Shake the container vigorously several times over the next hour.
Place the container in a dark, quiet location and leave it alone for a minimum of 24 hours. Ensure that the shellac separates into a clear shellac top layer with a hazy wax layer on the bottom before proceeding. If the mixture doesn't separate, the flakes may be too old.
Insert a coffee filter into a funnel. Place the funnel in a second clean glass container. Slowly pour the top layer of clear shellac through the filter-lined funnel into the fresh container. Make sure you transfer only the clear portion, leaving the murky wax layer behind.
Place a lid on the container of clear, dewaxed shellac. Shellac is best used fresh, preferably within several months of mixing.