Trans Tints work great in shellac, reduce with alcohol then add to shellac (It's best if you're cutting your own shellac.) I don't remember exactly what it took in a 4-lb cut last time I used it, but I remember it was a 4-lb cut and it took about the amount of tint I expected. (Maybe 2 tb in a pint of shellac? Maybe?) This was pthalo green onto birch, so draw your own conclusions.