Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Should Stainless Steel Rust?

My only complaint about this tiffin is that it is supposedly constructed of stainless steel, yet after just a few months of occasional use, it has developed rust both on the outside (around the clasps) and inside (within the groove along the top of the top tier). Because of rather infrequent use, I am puzzled as to the cause. Perhaps it results from being air dried after I wash it by hand. However, I have not encountered this problem when air drying other stainless steel wares.It may be safe to continue using it, and perhaps ingesting iron oxide is not toxic, but I would rather not take that risk, and it is certainly unsightly and does not portend well for its durability.