"Sigma Aldrich in particular should know what they are talking about"
Yes, look, same website:
"grade for mineral oil production sites,
untaxed"
https://www.sigmaaldrich.com/catalog/product/sigma/p6501?lan...®ion=DE
Or "untaxed product":
https://www.tn.gov/content/dam/tn/revenue/documents/forms/mo..."The tax is also imposed on owners of a hazardous substance which is transferred to a public storage terminal and to any transferor of a previously untaxed nonpetroleum hazardous substance from a major facility to one which is a non-major facility."
https://www.state.nj.us/treasury/taxation/spill_over.shtmlIt's little use cherrypicking links to support one answer over the other. You can google for "tax exempt," which is what I'd choose:
"To support nontaxable sales reported on your returns, you should retain the following documents...Certificates provided to you by your customers for the purchase of tax-exempt fuel"
https://www.cdtfa.ca.gov/formspubs/pub12.pdfAlso, it'd be nice if you stop saying "agree" when you're posting an agreement (am not blind!) and "don't agree" is not enough for a disagreement as per forum rules.
Best and enjoy your evening