In summary, stainless steel does not rust because it is sufficiently reactive to protect itself from further attack by forming a passive corrosion product layer. (Other important metals such as titanium and aluminum also rely on passive film formation for their corrosion resistance.)
White Collar. White-collar workers usually perform job duties in an office setting. They are highly skilled and formally trained professionals. Many white-collar workers, such as accountants, bankers, attorneys and real estate agents, provide professional services to clients.
In its most basic usage, to say that one person is working a white collar job and another is working a blue collar job carries the significance of salary size. The blue collar worker might not earn a salary at all, he might be working for hourly wages, or he may get paid for every item produced or assembled.