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Tests on  risks of residues in bee products


For these tests the Institute of Apiology of the University of Hohenheim received two wooden boards coated with PIGROL Beutenschutz-Farbe (glaze in brown, lacquer in green) to our laboratory for residual tests in order to perform tests on residue.  Tests need to be performed in order to figure out the paints' resistance to solvents, which can be taken as a criterion for the superficial release of coating components and possible residues in wax and honey.  In order to search for certain residual products the laboratory received a list of all single components used in the coatings formulation. The coating of both products was sanded off using a belt grinding machine. The sanding dust was caught in vessels and mixed in our laboratory with a quite aggressive solvent mixture (Acetone/ Hexane 1:1) and then was stored in a dark storage place for three days.


During this storing time the jars were shaken intensely several times, so the founding wood dust came in contact again with the solvent mixture. Afterwards the vessels were centrifuged and partially taken for a gas chromatographic analysis. The purpose of this analysis was to figure out if components of the coating dust could be extracted and identified. The samples were tested gas in the scanning mode, which are normally used for residue tests of honey and wax.




The analysis of the color extracts showed that the coatings did not contain any substances which can be detected respectively no substances could be extracted from the dried coatings.



The results of residue analysis of both coatings show that no color components can be extracted from the coatings even under worst-case conditions, which would lead to a contamination of bee products.


Since the solvent mixture has a much higher extracting effect on the coatings than bees walking over the dried coated surfaces of bee hives, it can be excluded with the utmost probability that a measurable contamination of bee products can appear under normal apicultural practices.

From the point of residue analysis there is no objection to use both products as coatings for bee hives.




download of the complete test summing-up: