Assertion: gamboge | /r/MadeOf | a py151+po62 mixture
Facets:
Source sentences:
text: M. Graham gamboge was the first source of the pure pigment in watercolors, which was discontinued in 2001 for a "gamboge" made with a PY151+PO62 mixture; in 2007 Daniel Smith came into the market with their permanent yellow deep, and thereafter M. Graham brought the pigment back into their line.