When did it become common for optical brighteners to be added to commercial laundry detergent?
score:7
Accepted answer
Household laundry detergents with fluorescent optical brighteners were common by 1967.
See Optical brighteners as detergent additives Journal of the American Oil Chemists' Society, Volume 45, pp 497–504 (July 1968).
See especially table XI which gives the specific compounds in use in 7 different US laundry detergents as of early 1967.
See also The use of optical brighteners for synthetic fibers in detergents Journal of the American Oil Chemists' Society, Volume 46, pp 75–80 (February 1969)
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