I'm sure that I'm not the first person to think of this but figured that I'd still share. I'm working on a Marine Corps retirement cake this week. That's a lot of reds and blues! I was dreading all that coloring gel when I came up with the idea to use liquid food coloring in place of water when I melted the marshmallows. It gave me a nice base color to start with and I am really pleased with the results.
I have only ever made mmf once but the next time I will have to try your method sounds much easier.
I actually do something similar. I still use water (maybe a little less) and then just mix it in once the marsmallows have melted adding color until I get the exact shade I am looking for!
I haven't had a problem with this yet as far as consistency or anything like that.
So I can use Food Coloring instead of Color Paste.I have only tried it once by using Color Paste and I had trouble when i rolled it out on the cornstarch.
Thanks
stacy
I did the same as Amber, just put the color in right after the melting, i only have pastes or gel colors, i just the gel and it went really well.
Probably you could also use color liquids, Stacy! But when you put in the pastes when they are melted, just stir a bit and (hopefully 
) it dissolves completly. Goodluck! 
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