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Message: <blockquote data-quote="stickman" data-source="post: 812147" data-attributes="member: 31227">In 2018 and again in 2020 I mentioned annealing being a potential issue with glass breaking as discussed on this forum. I like the polariscope idea as it really allows you to see the stress in question. The only issue I have with the video is the constant reference to poor carboys from Mexico and no mention of the "other" country. The first carboy he puts in front of the polariscope at 13:18 shows no stress defects and you can clearly see the words "made in Mexico", as well as the circle VR logo indicating the specific manufacturing facility (most likely the Vidriera los Reyes plant). Later at 15:00 a carboy is shown with stress which he says is from Mexico, but there are no bottom punt marks visible confirming the manufacturer, the only marking is "5 gallon" in lower case letters which is unusual. This is just my speculation here, but there is a good chance the questionable carboys are coming from China. Nothing new, as usual buyer beware, with significant counterfeit products being sold on open markets, it is best to purchase from reliable suppliers.</blockquote>

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