I didn't get time to go and get gold luster dust, but i do have silver.
I was making a brown suitcase cake so i was wondering if silver would go ok, would of really preferred gold or bronze.
Any alternatives i could use, re colours to make it look similiar to what i want?

I am having same issue. I bought brown luster dust and I have silver/iridescent and am going to try and mix it and see if it makes it bronze or copper like. Maybe that would work and it will look like pewter?