Extrordinarily beautiful!! What a work of art (and patience).. And very special for the recipient. You can iron the ribbons as long as you use a pressing cloth over them. I use a damp flour sack towel, you could also use a piece of muslin, just don't put the iron hotter than a cotton setting. I'd start with wool and see how that works first. Don't spray the ribbons, but make sure the pressing cloth is damp. Can't wait to see the end result. Good luck.