Pthalo Green is a synthetic pigment (full name Pthalocyanine). It is a bright, high intensity colour used in oil and acrylic based artist's paints, and in other applications. See (Pthalocyanine) for more details.
Wikipedia (http://en.wikipedia.org/wiki/Main_Page)
Pthalo_Green (http://en.wikipedia.org/wiki/Pthalo_Green)
version history (http://en.wikipedia.org/w/index.php?title=Pthalo_Green&action=history)
GNU Free Documentation Lizenz (http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License)
CC-by-sa (http://creativecommons.org/licenses/by-sa/2.5/)
