The normal color of beef is brown. Red dye may be added in some cases to improve the color. The inside will go back to brown before the outside and the beef is probably still useable. Check the sell by date and use it within two days of the sale by date. Check the smell and don't use meat that is off-putting. If the entire package of refrigerated meat is brown, it has been packaged long enough for all of the red dye to oxidize and is probably not edible. Frozen meat will be brown.