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Whenever conducting chemistry experiments one should always make sure to use proper safety procedures and equipment such as (but not necessarily limited to) adequate ventilation, eye & skin protection, awareness of and adherence to any relevant governmental regulations and, if one is a minor, close parental supervision. This video and description are for entertainment and informational purposes only. ("v" indicates following number is subscript) Hv3BOv3 (boric acid) + 3CHv3OH (methanol) ----} B(OCHv3)v3 (trimethyl borate) + 3Hv2O (water) It is the trimethyl borate fumes that are burning green (along with any left over methanol which burns a less visible blue). While relatively safe to handle, trimethyl borate is a gas that can irritate eyes, skin and respiratory systems, is invisible, obviously flammable, somewhat explosive in high concentrations and is heavier than air (it flows downhill and pools at the lowest point it can reach). A material data safety sheet for trimethyl borate - https://www.mathesongas.com/pdfs/msds... A Dow product safety assessment for trimethyl borate - http://msdssearch.dow.com/PublishedLi...