Silverlake

BMW first used this paint on a E93 3 Series convertible. The Bentley paint was requested by a Russian who wanted his wife's car to be the same of his Continental.
Later on a customer was informed of this paint's existance when confirming a new build of his F80 M3 (due to a paint defect on his original Frozen Brilliant White order, read the full story here). Since then the paint has appeared on a few more BMW's but remains quite rare.