The following information was excerpted from the South Carolina Code of Laws, Title 1, Chapter 1, Article 9, Section 1-1-710.
Title 1 - Administration of the Government
CHAPTER 1. GENERAL PROVISIONS
ARTICLE 9. STATE EMBLEMS, PLEDGE TO STATE FLAG, OFFICIAL OBSERVANCES
SECTION 1-1-710. Official State color.
The color indigo blue worn on the uniform of Colonel William Moultrie's soldiers and adopted as the background of the South Carolina State flag, is designated as the official color of the State of South Carolina.
State of South Carolina. South Carolina Code of Laws. Columbia: State of South Carolina, 2011. Web. 21 May 2011. <http://www.scstatehouse.gov/code/statmast.htm>.
Shearer, Benjamin F. and Barbara S. State Names, Seals, Flags and Symbols: A Historical Guide Third Edition, Revised and Expanded. Westport, Conn: Greenwood Press, 3 Sub edition, 2001.