About once a week someone will post about how to make that gold finish on fondant, or how to make that sequin cake, etc. etc. And how to get it as shiny as the ones in the photos.
The problem is that a lot of the photos that people are using as examples are obviously heavily photoshopped. Unless you use a real gold leaf there's very little chance that you're going to find something that will give you a really metallic look on fondant. It might be shiny if the light is right, but it won't be truly metallic.
I'm not saying that every photo of every cake is photoshopped, but I suspect that there's a lot more manipulation going on than people are willing to admit. Especially with professional wedding photographers, photos these days seem to be on the overexposed side, too (it's a look.) So not only are you seeing added shine to a picture, it's also lighter than it would be normally.
Here are two pictures of a dummy cake that I have hanging around. The first is the real dummy, the second is a photoshopped version with different textures applied to it.
The second photo has had the exposure adjusted, three different silver textures applied to the tiers, shadows and highlights adjusted and some of the flowers removed. So if someone wrote to me and asked how to do the texture on each tier there's not going to be a good answer because the whole thing is totally fake.
Just keep in mind that when you're looking at photos of gorgeous metallics on cakes, chances are that they've been enhanced in some way. This is REALLY important to point out to the customers who hand you a picture and ask for a specific cake, too. If you can't replicate something that doesn't exist in reality, you'd better let the customer know.
Kara Buntin owns A Cake To Remember LLC in Richmond VA, and cake supplies online at www.acaketoremember.biz and www.acaketoremember.etsy.com