It suppose to be within the wax (pigment that is).
Did you mix your own or bought premixed?
In any case try to leave it for a day before waxing (wax could be buffed at any time - I remember my Grand Ma used to make us wear special felt slippers in her house - her inlay floors were waxed...)
You might need to do it several times (waxing) to achieve desired saturation of color.
learn fresco at http://FrescoSchool.org
fresco painting video tutorials: http://www.FrescoSchool.com
Fresco School Video Channel
Contemporary Fresco Gazette
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Contemporary Fresco Painting Resouce Center