I'm sure you're aware that ferrocyanide is not the same thing as cyanide - the cyanide is bound so tightly to the iron center that it is nontoxic.
> However, like all ferrocyanide salt solutions, addition of an acid or exposure to UV light can result in the production of hydrogen cyanide gas, which is extremely toxic.
Now that does seem like a bit of a concern, doesn’t it?
It's a matter of quantity, like all things toxicity.
That is not potassium cyanide.
Yes, sorry, shouldn't post in a hurry. I amended my post. I'm not worried about the stuff at all, I buy salt with it all the time. But it's not sand, that's all I wanted to say.