I use lots of shellac. Mostly amber and all of it is Zinsser brush in the can from big box stores. The shellac they sell as clear is not clear. It is pale amber. According to the manufacturer, the only shellac they have that is dewaxed is the sanding sealer. The sanding sealer is as clear as it gets, and it isn't clear. There is no such thing as clear shellac, as far as I can see.
Yes, I know they label it as clear, but it isn't.