Date: Thu, 14 Dec 2023 21:18:38 +0000
Dear AMMRL,
Over the years, many of our 4 mm MAS rotors have developed a greyish/brownish
discolouration on the outside. It’s usually limited to the top and bottom
sections of the rotor, and it won’t come off with water, isopropanol, or
acetone.
Does anyone know what this is and how to best clean it off? We want to clean
the rotors so we can determine if this is an ongoing issue or due a previous
probehead. My first thought is to try a solution of Bar Keeper’s Friend
(or diluted oxalic acid), but could it affect the rotor in some way?
Thanks,
Sameer
--
Sameer Al-Abdul-Wahid, Ph.D. | Manager
Nuclear Magnetic Resonance Centre | University of Guelph
519-824-4120 Ext. 58914 | s.wahid_at_uoguelph.ca<mailto:s.wahid_at_uoguelph.ca>
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(image/jpeg attachment: rotors.jpg)