Material 304 stainless steel tableware poisonous
Food-grade 304 non-toxic, but not long soak acid (vinegar), salt reduction, for a long time will be corrosion type into a spot. 316 model is the best stainless steel, never rust.
Regular big or famous brand, with material 304 stainless steel products, is no problem in safety. But small factory, the material is true, don't know
You worry about is toxic heavy metal elements such as chromium in stainless steel, nickel. 304 stainless steel chemical properties is stable, so as stainless steel, generally do not react, heavy metals will not enter the body of a person, is a food grade stainless steel, non-toxic, don't worry.
Strictly speaking, 304 stainless steel or contain trace toxic elements, but because the amount is too little, so there is no harm to human body.