I am planning to use gold luster dust mixed with lemon flavoring to color fondant for a cake I'm making. I would like to make fondant roses with the gold fondant. I've never used gold luster dust before and my question is......after I color the fondant gold, will it dry enough for me to make the roses? Or will the luster dust smear and rub off of the fondant when I try to make the flowers?

Thanks!

It will smear.  Definitely color the roses after you make them.

Thank you both very much! And yes, I did mean lemon extract instead of flavoring.

Bottled lemon juice will also dilute luster dust as well.  I was out of Vodka and used it once and it worked nicely. 

Yes, but lemon juice is highly acidic and mostly water, which can quickly melt/ruin/degrade fondant or gum paste.  The oil in the extract can't damage the paste and does help to keep the dust in place.