Tomlinson, Philippa, and Allan Hall. Dyes on Historical and Archaeological Textiles 3, pp. Dyes and Wools in Iron Age Textiles from Norway and Denmark. Journal of Danish Archaeology 7, pp. Includes several samples from the Viking Age, many of them from lesser-known sites.
Text includes many graphs and a complete catalogue of findings in table format.
Dyes in History and Archaeology 7, pp. Although kind of technical, the best few-page summary out there. Contains information on spectrochemical analysis as well as botanical information for various Viking Age dyes. Textiles, Cordage and Fiber from 16-22 Coppergate. The Archaeology of York, Vol.