The small etched BL in the ambermatic lenses near the hinge points was not used in Ray-Ban sunglass lens production until the late 1970s, and the cursive white Ray-Ban trademark logo on the lens was introduced in late 1982 and subsequently present on all Ray-Ban sunglasses including Ambermatics from 1983 onward up until the acquisition by Luxottica. These earlier B&L Ambermatic lenses were of much higher quality, changed color faster, and had a wider range of density than anything produced before or since.