Pink salt for cooking steak
Do not use pink salt unless you are following specific guidelines for food preservation. You could easily end up poisoning yourself or others if your are not careful.

Edit: I should add that I am referring to pink curing salt. The Himalayan pink salt is a different story and can generally be substituted for table salt. However if you are not 100% positive whether it is curing salt, don't use it as a seasoning.