The calcium ion depletion version is the correct one, at least from days handling fluorine chemistries. The poisoning risk covers a more diverse range of common fluorine compounds than just hydrofluoric acid. Skin exposure to these compounds is often sufficient for it to enter the bloodstream and there can be a significant delay to the effects as it moves through tissues.<p>Treatment for fluoride poisoning is intravenous calcium solution, which provides an ion buffer for the calcium ion depleting effects of the fluoride until all the fluoride binds to something that renders it inert.