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Bonna Problems

What causes the oxidation on horns kept in Bonna cases? The test report of an international testing laboratory traces it back to the adhesive used in the case.

It has now been proven that the oxidation of horns in Bonna cases comes solely from the adhesive used. This is shown by the test report of the international testing laboratory Modern Testing Services (MTS).

Test report by Modern Testing Services

MTS test report, page 1 of 8: cover page

MTS test report, page 2 of 8

MTS test report, page 3 of 8

MTS test report, page 4 of 8

MTS test report, page 5 of 8

MTS test report, page 6 of 8

MTS test report, page 7 of 8

MTS test report, page 8 of 8: comments on the results

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