d2378801_Concordia_University_Bookstore_NOLOGY_ACCESSIBILITY_STANDARDS_Section_508_Rule
[EITAS] 1194.22(c) [Category] Web-based Intranet and Internet Information and Applications [Supporting Features] Supports. Web pages provide redundant visual cues when color conveys information. (For example, text labels are used with colors to indicate actions.) [Summary of Supported] Supports [Section 508 Rule] 
Web pages shall be designed so that all information conveyed with color is also available without color, for example from context or markup.
BN College - Barnes & Noble at Concordia University Bookstore
Section 508 Rule