Engine "Hot tank" question

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The same stuff to etch glass, of course, hydrofluoric acid... that s**t is bad news of a whole different world kind of level, along the lines of Union Carbide at Bopal, India or perhaps Chernobyl...
 
This block was baked

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A form of fluoride if I'm not mistaken.
Yes, some water systems that use softening with lime and soda ash use hydrofluoric acid to fluoridate as it helps sequester any excess magnesium and calcium that may sneak by.
 
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