I seem to recall a wet chemical spot test for rosin residues.

Something that required:

	* Piece of filter paper.
	* Sugar solution .
	* Dilute Sulfuric acid.

If the final spot went red, it would indicate the presence of rosin.

Does anybody recall this test and have the details?

Thanks in advance 

Rich  Kraszewski 
Plexus Engineering Solutions 
 


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