Huaca Prieta fabrics with blue color that were analyzed, including

Denim jeans may have origins in ancient Peru as indigo dye found in 6,200-year-old cotton

Statistics of sequencing and assembly of the I. tinctoria and P.

Full article: An analysis of the fabrics from La Tiza, a site in the southern Nasca drainage

The preceramic excavations at the Huaca Prieta, Chicama Valley, Peru. Anthropological papers of the AMNH ; v. 62, pt. 1

PDF) Early pre-Hispanic use of indigo blue in Peru

Tom DILLEHAY, Vanderbilt University, TN, Vander Bilt

Use, symbolism, and access to red pigments based on hematite and cinnabar between 400 B.C. and A.D. 1450 in Huanchaco, a pre-Hispanic maritime community on the North Coast of Peru

Jeffrey SPLITSTOSER

Blue jeans have a 6,000 year-old Peruvian ancestor

Wari and the Huaca del Sol: Max Uhle's 1899 Textile Collection at Moche, Perú – Making “Meaning”: Precolumbian Archaeology, Art History, and the Legacy of Terence Grieder

PDF) Chronology, mound-building and environment at Huaca Prieta, coastal Peru, from 13 700 to 4000 years ago

PDF) Early pre-Hispanic use of indigo blue in Peru

Jeffrey SPLITSTOSER