Giving you a bump on this, and hoping maybe I can get an answer regarding the 2 as well.
I need to make a betty boop cake, and would love to do a betty boop, but I have no color flow, and the powder is quite expensive. Is there a way I can make her without the color flow?
I've used both. Royal icing works fine for it. I don't keep color flow on hand so the majority of the color flow pieces I have done is with royal icing.
Royal Icing acts exactly the same as Color Flow, except it tastes a bit better (not bitter like color flow). You do your outline with stiff royal and then thin it down just like you would thin down color flow to fill-in your outlines. Color flow is supposedly stronger and shinier than royal icing run-in pieces, but I have found that not to be exactly true. Royal icing pieces are plenty strong (they are softer than color flow, but only to the extent that you don't have to bite down quite as hard to eat a piece--they are definitely strong enought to do 3-D structures, etc...). Also, royal icing pieces are great because you can make them matte or shiny. If they dry faster, then they will be shiny. For example, if you want a shiny piece and it is humid that day, place your pieces in a closed oven with the light on to dry. If they are allowed to dry slower, (such as in a humid climate) they may turn out to have a matte finish.
I use royal icing and don't worry about the finish. I just leave the pieces out until they dry. If they turn out matte and I need shiny, I rub some crisco on them or dust with luster or pearl dust.
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