Creating Dark Green

John Singer Sargent used dark green backgrounds in several of his paintings to great affect.  An example would be "Lily, Lily, Rose". 

One way to create a wonderful dark green is not to add black to a mid-value green.  Instead, adding red creates a much richer dark green. 

When trying to get a dark green over an entire canvas, costs can be reduced by using large containers of  Winsor and Newton's Galleria paints.  Dark green can be created by mixing their "permanent green deep" with their "crimson".  the depth of the green can be controlled by the amount of green added.  When the two colors are mixed in roughly equal amounts, they create charcoal gray; so more green than red makes the mix greener.