I'm making a ninja turtle cake and found that my MMF is too soft to keep my turtles from turning into blobs!  So I decided to make some modeling chocolate with white vanilla wilton discs but ended up coloring it too dark.  This is my first time using  modeling chocolate.  Can I use some of my colored fondant to mix into the modeling chocolate to :

# 1 - lighten it up a bit?  

#2  -  make use my perfect color for ninja turtle MMF that I made a ton of? 

#3 - if I do mix in the fondant, will it make my modeling chocolate too soft and I'll end up with a blob again????? 

Thanks so much for your help!!!

It's my understanding that it would in fact soften your modeling chocolate.  The modeling chocolate would slow the drying of the fondant, and the fondant would make the modeling chocolate more elastic.  I'm new to modeling chocolate, by the way, and I'm a fan. 

Can you get your hands on some gum paste or tylose powder to firm up your MMF?

You can add cornstarch to the fondant to tighten it up to hold it's shape.  It shouldn't be so soft that it becomes a blob!

For modelling characters, I've used a small amount of modelling chocolate into fondant as it helps me to spend more time modelling without it cracking and drying out. 

But, if your wanting it to harden up quickly, then as Jessicake says, use tylose or gum trag, it's effective and immediate...

thanks for that tip, Pasteybag Lady, I'll try cornflour next time :) 

Thanks to all of you for responding to my question.  I'm going to add the tylose and be patient to let the figures harden a little in between stages.  I'm also going to try the cornstarch too.

Appreciate it!

I add modeling chocolate and fondant together all the time. But the tylose will probably work better for what you're doing.