I'm sure others will add to this.
Boiling can cause them to explode, more commonly to crack. 175F is good though.
Drop vinegar on them. If it fizzles/foams it is not good.
Actually I have never done either but that is taking chances.
Boiling can cause them to explode, more commonly to crack. 175F is good though.
Drop vinegar on them. If it fizzles/foams it is not good.
Actually I have never done either but that is taking chances.