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Re: Michael Lowenstern's bore oil experiment

Author: The Doctor ★2017
Date: 2018-04-28 00:21

(Disclaimer - I sell a plant derived oil mixture for wooden instruments and genuine Grenadilla oil.)

I guess that you will have to believe me when I outline experiments that I myself have done. I have no publications about woodwinds but over 100 peer reviewed scientific articles and experimental studies in the public health arena during my 35 years tenure at the Centers for Disease Control and Prevention and 7 years at the National Institutes of Health and NOAA many of which were at the lab bench. I have no time or now have no access to the necessary instrumentation to repeat and film these experiments over again.

The cell wall weakening can easily be viewed in a cellulose stained section of tenon cork with light microscopy. Cork cells are little resilient cubes which can compress and rebound once physical pressure is applied to the cork. Petroleum treated cork with show cork cubes with broken cell walls which will not rebound if pressure is applied. It is a little more difficult to assess in Grenadilla wood but counting cells that have broken cell walls is very evident viewing many microscope fields.

As far as oiling and cracking are concerned I agree that a good experiment has not yet been done. It can be proven that dried out Grenadilla wood has lost dimensional stability by measurement or weighing which affects the sound of the instrument and oiling and rehydration improves this condition. There is anecdotal information about instruments that crack that have and have not been oiled but I believe that a prudent person will try to keep their instrument from insults such as temperature, physical abuse, and IMHO replenishing oil and moisture lost over time and with environmental conditions. We are dealing with a fragile organic material that has a lot of physical strain induced from manufacture and also hydrostatic strain from either gaining or loosing moisture and natural oil. When dealing with wood there is, in my opinion, no way to tell if oiling will keep and instrument from cracking but with this uncertainty I choose to oil my instruments to personally modify the loss of oil and moisture variable. Your choice may be different.

Again, it should be emphasized that to do any experiment you must use an oil that has been proven to penetrate Grenadilla wood. Mineral oil in my opinion does not. I extract Grenadilla oil from instrument manufacturing saw dust and it is easy to see it absorb into dry wood.

L. Omar Henderson, Ph.D.
www.doctorsprod.com

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