Comment by sevensor

Comment by sevensor 3 days ago

I TAd a semiconductor fabrication lab class 20-odd years ago. Mostly it was about making sure the students had the absolute fear of God put into them about working with HF, but there was also a bit at the end where you actually got to do a voltage sweep and characterize your transistor. If in fact you had made a transistor rather than a needlessly complicated resistor. The other TAs and I passed this paper around and thought it was just hilarious.

dvh 2 days ago

And then there are Etsy moms making frosted shot glass

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sevensor 2 days ago

I would make them reread the MSDS.

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- kragen 2 days ago
  
  I've seen an MSDS for sodium chloride USP that recommends against use in food, and says that you should wash your skin with abundant water for 15 minutes if you contact it and seek immediate medical attention if it gets in your eyes (after, of course, spending 15 minutes in the eyewash station). It also warns you to keep it away from sources of ignition, that it should not be released into the environment, and that you should not handle it without gloves and face protection.
  Here, this is the first sodium chloride MSDS I googled up: https://www.fishersci.com/store/msds?partNumber=S64010&produ...
  
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  throwanem 2 days ago
  
  Fortunately, HF is as safe as NaCl. Or so I take you to suggest, this otherwise totally failing to follow from anything anyone has said...
  
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sizzle 2 days ago

With HF?! Got a link to this madness?

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- somebodynew a day ago
  
  Most craft stores carry a glass etchant like Armor Etch [0] as an over the counter product. The MSDS [1] indicates that it's an aqueous solution containing ammonium bifluoride, which exists in equilibrium with hydrofluoric acid.
  [0] https://www.michaels.com/product/armour-etch-glass-etching-c... [1] https://www.jacksonsart.com/media/pdf/armour_etch_sds.pdf
  
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