I, absolutely, agree.You are quite right. The vintage butterscotch are beautiful.
The plastics manufacturer that supplies the plastic for shaving brushes should borrow a colorimeter and scan a whole bunch of vintage shaving brushes, mah-jongg tiles, jewelry and other objects with naturally aged Bakelite and go from there…
A lot of the modern butterscotch leans way too orange.
I bet that there is a colorimeter app for their phones that could get them pretty close.