Alcohol burner the original information doesn't provide safety ways to use it an example video (how to light up and close it properly) explain the mechanism, how it works. What alcohol is used? Why a cap is important.
References
edithttps://www.homesciencetools.com/content/reference/CE-LAMP2%20Web.pdf https://www.mccrone.com/mm/how-to-makemodify-and-use-an-alcohol-lamp/ https://www.sc.edu/ehs/training/Fire/01_triangle.htm