What is a 'chromium cover' of a comic book?

What is a 'chromium cover' of a comic book?

Mark Zaid (Owner of Esquire Comics) gives expert video advice on: What are the different types of comic book covers? and more...

A chromium cover of a comic book also came about more in the late 1980s, early 1990s. These were special foil-like covers that were primarily designed to spur sales and interest in that particular book. Spiderman and Marvel Comics used it quite well to their advantage for sales purposes.