If you're talking about brush embroidery, I can't answer your question. But, if you're wanting to do initials or shapes with the embroidery technique that makes them look like they've actually been embroidered, you can always "embroider" the color flow or royal icing run-in pieces off of the cake with a small round tube, let them dry, and then attach them to the cake.
Ok...then you have the icing already...I thought you were debating getting it...I haven't used that icing before, but if it crusts, then you can do brush embroidery on it, just be gentle and use a soft touch. Also, be sure to use buttercream and not royal for the embroidery or you'll run the risk of the royal breaking down. Use a thinner medium buttercream to do the embroidery and you should be fine. I'd put a little buttercream on the pan and let it crust and use that to practice a few embroidery flowers (I'm assuming you're doing flowers) before you do it on the actual cake.
If it doesn't crust, then I don't think you can do it.
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