The Master-Cleanse might be a cleanse, but it is not the same as a liverflush. What you got out sounds more like bowelcleansing. The liverflush forces out the stones (mainly cholesterol) and with it you might get green and white kind of sludge, but not black and tarry.

yes I got tarry sludge doing the Hulda Clark s Liver Flush during flush#7

Before flushing I started out with chronic 24/7 major gall bladder attacks cant think horrific brain fog, pain in right side, uncontrollable MAJOR migraines and brain fog ( I was eating very healthy but consuming fats and gall bladder trigger foods ) , as I progressed with my 7 flushes the symptoms changed to horrific Body Odor with chronic lesser headaches and lighter brain fog and no pain in side but pancreatic pain. Now the current symptoms are.. bad Body Odor - migraines- brain fog / confusion only when I eat fats or almost anything not plain food or veggies and fruit ( in other words a very restricted diet ). Varying Flush results: Flush #1 ( 2 years ago ) 1/4 cup yellow chaff, flush #2 ( 2 years ago ) 1/4 cup chaff and 7 green pea sized floating stones, Flush #3 ( May '11 ) 25 pea sized green floating stones little yellow chaff. Flush #4 ( May '11 ) 45 pea sized green floating stones, three 1/4 " green floating stones, little yellow chaff. Flush #5 ( June '11) 60 pea sized green floaters and two 1/2" green floating stones and later a 5" parasite. Flush #6 ( June 2011 (threw it up 2.5 hours into it ) 1 cup of yellow sand and about 30 floating yellow stones. Flush #7 ( July '11 ) two pea sized green stones 1 1/4 cup of molasses colored chunky sludge so sticky I had to throw the colander away as it wouldnt come clean ).