Ok, I think the order goes like this: seedlac, buttonlac, ruby shellac, orange shellac, blonde shellac. In order of "refinement".
Buttonlac comes in cool "buttons"..round disks about an inch and a half across. Crush them up, put them in a jar of alcohol and walk away. Come back and swish it around from time to time and in a few days, presto, ready to use buttonlac. I don't use it for top coats, so I am not the least bit worried about the "pound cut" (whatever that is), or filtering it out.