Ignaz Schiffermüller, table of blue colors, 1772.
Schiffermüller's system called for a series of charts, as Schäffer's system had. He used blue rather than Schäffer's choice, red, as his example. The resemblance is only superficial, however, as they offer different information.
Source: From Ignaz Schiffermüller, Versuch eines Farbensystems (Vienna, 1772), plate II.
Credit: Photograph © 2002 Board of Trustees, National Gallery of Art, Washington, D.C.