# \#subtractive-colour-mixing

**URL:** https://scanalyst.fourmilab.ch/tag/subtractive-colour-mixing/4832.md

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## [Can Purple Make Yellowed Things Whiter?](https://scanalyst.fourmilab.ch/t/can-purple-make-yellowed-things-whiter/3809)

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**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\
**Replies:** 0\
**Last updated:** [30 September 2023 13:26 UTC](https://scanalyst.fourmilab.ch/t/can-purple-make-yellowed-things-whiter/3809 "2023-09-30T13:26:50Z")

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Ages ago, people used to add “bluing” to wash water when washing white fabrics—it works on the same principle. Some laundry detergents include fluorescent whitening agents to achieve the same result today. …