1990 Football Topps Tiffany -vs- Base Cards
The regular Tiffany cards differentiated from the base Topps by being printed on white card stock with a high-gloss coating. Many sellers on eBay and other sites, will list their regular cards as Tiffany cards. The easiest way to determine a Tiffany card from a regular issued base card is to look at the back of the card. The Tiffany card backs will be a white background, while the regular issued cards will appear to be a gray.
It is also important to note that many sellers will attempt to brighten the regular cards to give the appearance of a Tiffany background. With current printing technology some sellers have now created their own fake reprint Tiffany cards, which can make it impossible to tell the difference between a real Tiffany card and fake by simply looking at the back. Therefore, once you have the card in hand you will want to check the thickness and gloss of the card by comparing it with another Tiffany card of the same year.