Two small sable brushes are for Veining, as in geraniums.
"The Royal Guide to Wax Flower Modelling"
Emma Peachey
The pistillum and stigma are painted entirely over with the same colour previously used for Veining.
"The Royal Guide to Wax Flower Modelling"
Emma Peachey
If Veining is required, use different shades of the same mixture, and for the deepest places, black.
"Young's Demonstrative Translation of Scientific Secrets"
Daniel Young