I remember my mother would add "bluing" powder to the final rinse. I guess I was "destined" for color management 😊 / Roger -----Original Message----- From: colorsync-users <colorsync-users-bounces+graxx=videotron.ca@lists.apple.com> On Behalf Of Vincent Heuring via colorsync-users Sent: Tuesday, June 18, 2019 3:23 PM To: colorsync-users@lists.apple.com Subject: Re: colorsync-users Digest, Vol 16, Issue 38 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 heuring@colorado.edu c)720-346-4635 http://ecee.colorado.edu/~heuring