I took the big step and made the mmf for my daughters 8th birthday cake. I did exactly what the recipe called for and let it set overnight and just about said every curse word in every language I know them in (in my head, of course!) trying to knead in purple food coloring, only able to get it marbled at best. So here's the big question: If I know exactly what color I want to use as a base color, can I just color the marshmallow before I mix the goop into the sugar?
Debbi
Yes it's much easier if you color the whole batch BEFORE while it's hot. If you're going to use different colors then you color it after the mix is done and it sits for a while. Just divide in pieces and knead color in, but if all the MMf is gonna be one color do it before while marshmallow is still warm.
Wandy
thanks for your response, i have been making mmg way to hard@!!!!!!! plus i was using red so i had to knead forever and hands hurt, arms hurt and was getting frusterated! i'll try to put the color in melted goo before i add powder sugar. thanks for info!
melody
Wandy,
thanks for the reply! Since I know I can add the coloring to the goo before I add the sugar, have you ever tried making mini-batches? I'm thinking that inste3ad of mixing all of the goo at once I can use smaller amounts to make the colors I want?
Debbi
LOL..I also did not think of putting it in before the sugar. Although, what I've been doing is making a large batch of MMF (marshmallows w/ sugar), wrapping it up in smaller batches and then when I need some I just pop it in the microwave for 20-30 secs till pliable and then knead the color in. It does take some work..kind of like kneading bread, but I've been able to get the color uniform and all the physical work is kind of therapeutic in a weird way
Wondering too, if you can judge the outcome of the color if you put it in before adding the sugar? Still a good idea to get the color started though! The things you learn!
Thalia
Ditto, here! I added color afterwards... Luckily, I was only making flowers and didn't have to knead a whole lot, but it still took work...
So, when we melt the marshmallows and while still hot, I mix in the color and stir.....? Then add the sugar?
Yup! That is what i did and it worked great.. LOL I was making pink MMF.. Went to the store and realized they sell pink Marshmellow.. Felt like a dummy! 
Here is a pic of my cake..woohoo I mastered MMF..
http://www.cakecentral.com/modules.php?name=coppermine&file=displayimage&meta=allby&member_id=1934&cat=0&pos=0
Well let me see if I can explain this well...
For example if I'm making decorations for a cake like different colored flowers and leaves I do it in stages. I do the MMf completely let it sit overnite (at least an hour is good) the next day I divide it depending the colors I need. I start coloring and kneading you can microwave it if its a little dry -I think 5 to 8 sec are enough- If it's sticky I use cornstarch for light colored fondant and crisco for darker colors so the colors won't be affected.
But if the MMF I'm using is to cover a whole cake one same color you can add the color (americolor the best in the world MHO) before adding the sugar while the marshmallow is still hot. I like to melt my marshmallow in a bowl over boiling water so I can add the water little by little but this isn't neccesary, is just my personal preference and option. 
I really love working with MMF best when doing small decorations, little people, flowers... You can also add a small bit of gumpaste so it will dry harder.
Hope this helps you all.
Wandy
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