2.1.1290 Part 1 Section 20.1.8.16, clrChange (Color Change Effect)

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a.   The standard states that attribute useA specifies whether alpha values are considered for the effect.

In Office, if the value of useA is true, alpha is considered for finding a match for clrFrom, and the alpha is replaced with the alpha value in clrTo. If useA is false, no alpha values are changed.