Re: colorsync-users Digest, Vol 16, Issue 38
Re: colorsync-users Digest, Vol 16, Issue 38
- Subject: Re: colorsync-users Digest, Vol 16, Issue 38
- From: Vincent Heuring via colorsync-users <email@hidden>
- Date: Tue, 18 Jun 2019 12:23:07 -0700
- Ironport-sdr: 7iN9qf1mjuo/uQkvUlGE8QbGovhxyw/VvFiPswamPlguQbyDzwe6UAc1kHg0JYVzPeGGXWksvl zQE7reWsPswdajJCWqr+lPXiBm5DsP14w=
Back in the day, I was a chemist for P&G. Almost all laundry detergents have a
“brightener” added, to counteract the faint off-white cast of laundry. As
described, they absorb UV, and emit blue, which counteracts the slight yellow
cast of the laundry. Before the advent of brighteners, housewives would add
“bluing" to the final rinse. Bluing was a shaker bottle of a suspension of blue
dye.
See https://en.wikipedia.org/wiki/Optical_brightener for more details.
--
Vincent Heuring Professor Emeritus Dep't of Electrical, Computer, and Energy
Engineering
University of Colorado at Boulder h) 73335 Pinyon St,
Palm Desert CA 92260
email@hidden c)720-346-4635
http://ecee.colorado.edu/~heuring
> On Jun 18, 2019, at 12:00 PM, email@hidden wrote:
>
> There’s nothing like a free lunch. Through OBA’s the paper industry succeeded
> to turn paper into mini displays (capture UV-light and emit as blue light).
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