Are there any tricks? I need to cover schoolhouse cookies. I saw the threads about using kool aid, but am afraid it will make them too tart. Any suggestions?
I don't know about tinting the MMF to get red, but I do know that Satin Ice is available already made in red, black, and a couple of other dark colors.
I've always thought that if I needed one of those colors, it would be well worth it to buy it alredy colored than to try to get good results on my own!
Laura.
Do you have Americolors? The red is amazing. If not, do you have access a cake decorating store that sells food coloring other then Wilton because those other brands work well also.
I just colored MMF orange last night with the food coloring drops from the grocery store (only because I didn't have anything but yellow on hand in the paste colors, like people have mentioned above). I kneaded it into the MMF
What a mess. I've learned a few things: get gloves for your hands and something that you don't have to scrub to catch the drips and run-over. Though with the paste colors this woudn't be such an issue.
Also took some muscle to work it in completely, I never quite eliminated the subtle swirls.
Again, this could all be because of the type of coloring I used.
I didn't have as many problems with the thicker stuff that I used.
3 words-Americolor Super Red!!! The technicolor nightmare wedding cake in my pics had two mmf red heart side cakes. I added the color to the melted marshmallows until it was the red I wanted, I zapped it for just a few seconds to get the heat back up and proceeded as usual with the fondant making. I was so proud of how well they turned out and the pretty red that they were. That and I managed to get the fondant so smooth-I'm a fondant newbie!
I won't go back to Wilton after using the Americolors. I made some red and black for my MMF superman cake this weekend and the colors are fantastic. I kneeded it into the fondant after I warmed it a little in the microwave. I just got some rubber gloves and put a piece of parchment down to protect the counter. I needed to add a little extra powdered sugar since it got kinda sticky but the colors turned out great.
I agree with using americolor super red and wearing gloves. I think I still have to add a good bit of the color but not nearly as much as you do with wilton. Also do the coloring the day before and let it sit. The color will darken as it develops. You'll be happier also with the result if it isn't all over your hands. 
Someone did use koolaid to make red fondant (it was an elmo cake a week or so back) You could ask that decorator if if was too tart if you could find it!
I have also used the americolor red and had great results! I also found a product called chefmaster colors. They work great as well.
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