male Goldust het hypo and a female Goldust het hypo
Because of the way Goldust (Ultramel + Caramel) works, you'll get a mix of Goldusts and other results. According to the Corncalc, the above combo will theoretically result in:
3 / 8 Gold Dust ( Ultramel, Caramel ) 66% poss het. Hypo
3 / 16 Ultra Caramel ( Ultra, Caramel ) 66% poss het. Hypo
3 / 16 Butter ( Amel, Caramel ) 66% poss het. Hypo
1 / 16 Hypo Butter ( Amel, Caramel, Hypo )
1 / 8 Gold Dust, Hypo ( Ultramel, Caramel, Hypo )
1 / 16 Ultra Caramel, Hypo ( Ultra, Caramel, Hypo )
Be aware that a sizeable chunk of the Corn community believe Goldusts to have been derived from hybridisation, so you may not have as large a market for those. However, it shouldn't make a difference if you're breeding for the pet trade.