Dear RoseSea and Paul,
  I too checked several chemical reference works and could not find a
listing for "rosalic acid".  In addition to Paul's comments regarding
rosolic acid being an indicator it is also poorly soluble in water so I
don't think it is the chemical that Rose is talking about.
 
Charlie
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Charlie Sturm, Jr
Research Associate - Section of Invertebrate Zoology
                     Carnegie Museum of Natural History
Assistant Professor - Family Medicine
 
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