2.1.1434 Part 4 Section 188.8.131.52, spPr (Shape Properties)
a. The standard states that bwMode is a valid attribute on the spPr element.
Excel and Word do not support this attribute on this element.
b. The standard states that the spPr element specifies the visual shape properties that can be applied to a special shape such as a connector shape or picture.
Office uses this element to specify the visual shape properties that can be applied to shapes, connector shapes, or pictures.
c. The standard states that the bwMode attribute specifies that the group shape should be rendered using only black and white coloring.
Office uses this attribute to specify how the group shape should be rendered when in black and white mode.