Hi! I did brooches on my own wedding cake. I used royal icing; I stuck the brooches on with royal and then secured it with toothpick all through the holes in the metal work of the brooch and all underneath the brooches as well. I left them like that for over 24 hours and left them in place during transport, then right before I left the reception venue (about 8-9hours before reception time) I pulled the toothpicks. They were fine when I arrived at our reception and remained fine until we cute the cake. You didn’t notice a thing from the toothpics.
