That is why I use Americolor.
The only suggestion that I have is to make a new batch of buttercream and add some cocoa and get it brown and start over. I used the red kool-aid when I made mine and the kids DID not like it at all. That is all I know, sorry that I couldn't be of more help.
BUY AMERICOLOR, you will love it and you can order it right here
On your new batch, use the Wilton red & try some food coloring. I have used regular food coloring and it didn't change mine at all. sorry, I hate it when I am pressed like that. It makes it worse.
Leave that batch sitting out or add some cocoa powder, I don't know what it will do, but it is worth a try.
I second the Americolor. I was making a lightning mcqueen cake and I had the same issues with wiltons red-red and black. The next day I bought americolor and added it to my dark pink and dark grey and within minutes I had and excellent red and blackest black. I will NEVER use wilton again.
This happened to me.. I had to go buy Wilton Red Color Spray icing... It worked great!!!
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