Ha! I was just researching about my tiny black flecks and came across this on Red stones. Not sure of it's accuracy so double check!

http://www.sunrisefarms.org/why%20liver%20cl.htm

"There are over half a dozen varieties of gallstones, most of which have cholesterol crystals in them. They can be black, red, white, green or tan colored. The green ones get their color from being coated with bile."

^ from the site

A lot of info. about red stones and what they are is here at Curezone. Just type in "red stones - liverflush" or some variation of that and you'll get a lot of info.