What was encaustic

Manufacturers and distributors of hot encaustic paints offer an extensive documentation on formulations, application techniques and artistic possibilities of this technique, which can be viewed on their websites. Especially complete are:
Arts Encaustic http://www.encaustic.com/
Enkaustikos http://www.encausticpaints.com/
R&F Handmade Paints http://www.rfpaints.com/

Other sources of information:

Michael Bossom. Encaustic Art: How to Paint with Wax. 1997. http://www.encaustic.com/products/book_HTP/book_HTP.html
Joanne Mattera. The Art of Encaustic Painting: Contemporary Expression in the Ancient Medium of Pigmented Wax, 2001. http://www.joannemattera.com/pages/book.htm
Michael Bossom. The Encaustic Art Project Book, 2002. http://www.encaustic.com/products/book_TPB/book_TPB.html
Cristel Krones. Encaustic: Malen mit heißen Wachsfarben. 2002; Cristel Krones. Encaustic für Fortgeschrittene: Experimentelle und künstlerische Ideen. 2005. http://www.encaustic-krones.com/
Patricia Baldwin Seggebruch. Encaustic Workshop: Artistic Techniques for Working with Wax. 2009. http://www.pbsartist.com/news.shtml
Linda Womack, William Womack. Embracing Encaustic: Learning to Paint with Beeswax. 2008. http://www.lindawomack.com/books/
Lissa Rankin. Encaustic Art: The Complete Guide to Creating Fine Art with Wax. 2010. http://www.lissarankinart.com/2/asset.asp?AssetID=7369&AKey=9y679bhn

Gail Stavitsky. Waxing Poetic: Encaustic Art in America. The Montclair Art Museum, 1999. http://www.tfaoi.com/aa/2aa/2aa626.htm

International Encaustic Conference http://www.encausticconference.blogspot.com/

Artists’ associations:
International Encaustic Artists: http://www.international-encaustic-artists.org/
The EncausticArt Institute: http://www.eainm.com/

Academies and workshops:
Encaustic Academie: http://www.encaustic-academie.de/