Hello, 

Please help me how can i pipe  gold henna mehndi design on cake. normally i use royal icing for other colours but for

gold? any easy way, or have to repaint in gold on royal icing?

Mary 

I've never done this, but from what I've read, there is no easy way. Pipe with dark yellow or matte "gold" and then paint over with a mixture of gold luster dust and alcohol (vodka, everclear, clear extract).