Rosin not fit for grading
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
An article consisting of rosin with an excessive amount of trash or other visible extraneous foreign material, or an article that is of such color or appearance as not to permit its accurate classification and grading in accordance with the standards provided for rosin, shall not be classified, graded, marked, sold, or offered for sale in commerce as rosin.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.