Science!
@sjvn Even the green ones still say: "probably fine."
What they really mean: there's some chance it could still kill you, but sure, probably fine.
I would watch this show with great interest. Beats the hell out of mind numbing bullshit like Wheel of Fortune and Keeping Up With the Kardashians.
@sjvn while the body is full of calcium ions I wouldn't want to lick pure calcium metal, it would react with the moisture most interestingly and probably not in a pleasant manner...
Still it's an amusing chart.